2024/10/07 更新

写真a

ユサ ヨウスケ
遊佐 洋右
YUSA Yousuke
所属
教育研究院 自然科学系 数理物質科学系列 助教
理学部 理学科 助教
職名
助教
外部リンク

学位

  • 博士(理学) ( 2005年3月   東北大学 )

研究キーワード

  • B中間子

  • 高エネルギー実験

  • 粒子識別

  • 光検出器

  • 医学物理

  • CP対称性

  • 放射線測定

研究分野

  • 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする理論

  • ライフサイエンス / 放射線科学

  • エネルギー / 量子ビーム科学

経歴(researchmap)

  • 新潟大学   自然科学系   助教

    2011年4月 - 現在

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  • バージニア工科大学   ポスドク研究員

    2005年9月 - 2011年3月

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  • 東北大学   理学部   研究員

    2005年5月 - 2005年9月

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経歴

  • 新潟大学   理学部 理学科   助教

    2020年4月 - 現在

  • 新潟大学   物理学科   助教

    2011年4月 - 2020年3月

  • 新潟大学   自然科学研究科 数理物質科学専攻 物理学   助教

    2011年4月 - 2020年3月

学歴

  • 東北大学   理学研究科

    2000年4月 - 2005年3月

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  • 東北大学   理学部   物理学科

    1996年4月 - 2000年3月

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所属学協会

  • 日本医学物理学会

    2024年3月 - 現在

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  • 日本物理学会

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論文

  • Study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>n</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>

    K.-N. Chu, Y.-R. Lin, M.-Z. Wang, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, Sw. Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, D. Biswas, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, E. Graziani, T. Gu, K. Gudkova, C. Hadjivasiliou, S. Halder, X. Han, K. Hayasaka, H. Hayashii, W.-S. Hou, C.-L. Hsu, K. Huang, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, Y. Jin, K. K. Joo, D. Kalita, A. B. Kaliyar, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, Y.-T. Lai, T. Lam, J. S. Lange, S. C. Lee, C. H. Li, J. Li, L. K. Li, S. X. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, S. K. Maurya, F. Meier, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, I. Nakamura, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, N. K. Nisar, S. Nishida, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, J. Park, A. Passeri, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, A. Rostomyan, N. Rout, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, B. Shwartz, F. Simon, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, M. Sumihama, K. Sumisawa, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, S. E. Vahsen, R. van Tonder, G. Varner, K. E. Varvell, A. Vinokurova, A. Vossen, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, C. Z. Yuan, L. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova

    Physical Review D   108 ( 11 )   2023年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Physical Society (APS)  

    DOI: 10.1103/physrevd.108.112007

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    その他リンク: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.108.112007/fulltext

  • B-flavor tagging at Belle II

    F. Abudinén, N. Akopov, A. Aloisio, V. Babu, Sw. Banerjee, M. Bauer, J. V. Bennett, F. U. Bernlochner, M. Bessner, S. Bettarini, T. Bilka, S. Bilokin, D. Biswas, D. Bodrov, J. Borah, M. Bračko, P. Branchini, A. Budano, M. Campajola, G. Casarosa, C. Cecchi, R. Cheaib, V. Chekelian, C. Chen, Y. Q. Chen, H. -E. Cho, S. Cunliffe, G. De Nardo, G. De Pietro, R. de Sangro, S. Dey, A. Di Canto, F. Di Capua, T. V. Dong, G. Dujany, P. Ecker, M. Eliachevitch, T. Ferber, F. Forti, E. Ganiev, A. Gaz, M. Gelb, J. Gemmler, R. Godang, P. Goldenzweig, E. Graziani, K. Hara, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hohmann, T. Humair, G. Inguglia, H. Junkerkalefeld, R. Karl, Y. Kato, T. Keck, C. Kiesling, C. -H. Kim, S. Kohani, I. Komarov, T. M. G. Kraetzschmar, P. Križan, J. F. Krohn, T. Kuhr, J. Kumar, K. Kumara, S. Kurz, S. Lacaprara, C. La Licata, M. Laurenza, K. Lautenbach, S. C. Lee, K. Lieret, L. Li Gioi, Q. Y. Liu, S. Longo, M. Maggiora, E. Manoni, C. Marinas, A. Martini, F. Meier, M. Merola, F. Metzner, M. Milesi, K. Miyabayashi, G. B. Mohanty, F. Mueller, C. Murphy, E. R. Oxford, S. -H. Park, A. Passeri, F. Pham, L. E. Piilonen, S. Pokharel, M. T. Prim, C. Pulvermacher, P. Rados, M. Ritter, A. Rostomyan, S. Sandilya, L. Santelj, Y. Sato, A. J. Schwartz, M. E. Sevior, A. Soffer, S. Spataro, R. Stroili, W. Sutcliffe, D. Tagnani, M. Takizawa, U. Tamponi, F. Tenchini, E. Torassa, P. Urquijo, L. Vitale, Y. Yusa, L. Zani, Q. D. Zhou, R. Žlebčík, A. Zupanc

    The European Physical Journal C   82 ( 4 )   2022年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    Abstract

    We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ("Image missing") mesons at Belle II. The algorithms provide essential inputs for measurements of quark-flavor mixing and charge-parity violation. We validate and evaluate the performance of the algorithms using hadronic "Image missing" decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb$$^{-1}$$, collected at the "Equation missing" resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (30.0 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$for a category-based algorithm and $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (28.8 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$for a deep-learning-based algorithm.

    DOI: 10.1140/epjc/s10052-022-10180-9

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    その他リンク: https://link.springer.com/article/10.1140/epjc/s10052-022-10180-9/fulltext.html

  • Performance evaluation of the aerogel RICH counter for the Belle II spectrometer using early beam collision data

    M. Yonenaga, I. Adachi, L. Burmistrov, F. Le Diberder, T. Iijima, S. Iwata, S. Kakimoto, H. Kakuno, G. Karyan, H. Kawai, T. Kawasaki, H. Kindo, H. Kitamura, M. Kobayashi, T. Kohriki, T. Konno, S. Korpar, P. Križan, T. Kumita, K. Kuze, Y. Lai, M. Mrvar, G. Nazaryan, S. Nishida, M. Nishimura, K. Ogawa, S. Ogawa, R. Pestotnik, A. Seljak, M. Shoji, T. Sumiyoshi, M. Tabata, S. Tamechika, Y. Yusa, L. Šantelj

    Progress of Theoretical and Experimental Physics   2020 ( 9 )   2020年9月

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    掲載種別:研究論文(学術雑誌)  

    TheAerogel Ring Imaging Cherenkov (ARICH) counter serves as a particle identification device in the forward end-cap region of the Belle II spectrometer. It is capable of identifying pions and kaons with momenta up to 4 GeV c-1 by detecting Cherenkov photons emitted in the silica aerogel radiator. After the detector alignment and calibration of the probability density function, we evaluate the performance of the ARICH counter using early beam collision data. Event samples of D*+ → D0π + (D0 → K- π + ) were used to determine the π(K) efficiency and the K(π) misidentification probability. We found that the ARICH counter is capable of separating kaons from pions with an identification efficiency of 93.5 ± 0.6% at a pion misidentification probability of 10.9 ± 0.9 %. This paper describes the identification method of the counter and the evaluation of the performance during its early operation.

    DOI: 10.1093/ptep/ptaa090

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  • Performance of the Belle II aerogel-based ring-imaging Cherenkov counter system in SuperKEKB 2019 phase 3 operation

    Y. T. Lai, I. Adachi, L. Burmistrov, K. Furui, T. Iijima, S. Iwata, R. Giordano, H. Kakuno, G. Karyan, H. Kawai, T. Kawasaki, H. Kindo, H. Kitamura, M. Kobayashi, T. Kohriki, T. Konno, S. Korpar, P. Križan, T. Kumita, K. Kuze, G. Nazaryan, S. Nishida, M. Nishimura, K. Ogawa, S. Ogawa, R. Pestotnik, L. Šantelj, M. Shoji, T. Sumiyoshi, M. Tabata, M. Tsurufuji, E. Waheed, M. Yonenaga, Y. Yusa

    Journal of Instrumentation   15 ( 7 )   2020年7月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    In the Belle II experiment, an aerogel-based proximity focusing ring-imaging Cherenkov (ARICH) counter is used for charged particle identification (PID) in the forward end-cap region. The goal is to separate kaons from pions at above 4σ significance level for momenta up to 4 GeV/c, which is critical for the measurements of rare B decays and CP violation in B decays. Chrerenkov photons are emitted in aerogel tiles and 144-channel Hybrid Avalanche Photo Detector (HAPDs) are used as the photo-detectors. We utilize a two-layer aerogel design with different refractive indexes in a focusing configuration. In Phase 3 of the Belle II operation (from Apr. 2019), the ARICH system has been operating smoothly. The performance of particle identification with ARICH has been well validated and is in agreement with simulation.

    DOI: 10.1088/1748-0221/15/07/C07039

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  • Calibration of the Belle II aerogel ring imaging detector

    R. Pestotnik, I. Adachi, L. Burmistrov, F. Le Diberder, R. Dolenec, K. Hataya, S. Kakmimoto, H. Kakuno, H. Kawai, T. Kawasaki, H. Kindo, T. Konno, S. Korpar, P. Križan, T. Kumita, Y. Lai, M. Machida, M. Mrvar, S. Nishida, K. Noguchi, K. Ogawa, S. Ogawa, L. Šantelj, T. Sumiyoshi, M. Tabata, S. Tamechika, M. Yonenaga, M. Yoshizawa, Y. Yusa

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   952   2020年2月

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    掲載種別:研究論文(学術雑誌)  

    For efficient separation of hadrons in the forward end-cap of the Belle II spectrometer, an aerogel proximity focusing Ring Imaging Detector is installed in the high magnetic field between the central drift chamber and electromagnetic calorimeter. Cherenkov photons, emitted in the double layer aerogel radiator are expanded through the empty space and detected on the photon detector consisting of Hybrid Avalanche Photo diodes. The readout electronics working in a threshold mode records hit patterns registered during beam collisions. A particle identification algorithm based on the two dimensional extended maximum likelihood technique is used to assign probabilities for different particle hypotheses of tracks traversing the aerogel RICH detector. For efficient discrimination, the Aerogel RICH detector has to be calibrated. We present the key calibration steps used to optimize the detector performance.

    DOI: 10.1016/j.nima.2019.01.027

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  • Measurement of time-dependent CP violation in B0 → KS0 π0π0 decays 査読

    Y. Yusa, t. al, Belle Collaboation

    Physical Review D   99 ( 1 )   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article&#039;s title, journal citation, and DOI. Funded by SCOAP 3 . We report a measurement of time-dependent CP violation in B0→KS0π0π0 decays using a data sample of 772×106 BB pairs collected by the Belle experiment running at the ?(4S) resonance at the KEKB e+e- collider. This decay proceeds mainly via a b→sdd &quot;penguin&quot; amplitude. The results are sin2φ1eff=0.92-0.31+0.27 (stat.) ±0.11 (syst.) and A=0.28±0.21 (stat.) ±0.04 (syst.), which are the most precise measurements of CP violation in this decay mode to date. The value for the CP-violating parameter sin2φ1eff is consistent with that obtained using decay modes proceeding via a b→ccs &quot;tree&quot; amplitude.

    DOI: 10.1103/PhysRevD.99.011102

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  • Performance and commissioning of HAPDs in the Aerogel RICH counter 査読

    Yonenaga M, Adachi I, Burmistrov L, Le Diberder F, Dolenec R, Hataya K, Iijima T, Kakimoto S, Kakuno H, Kawai H, Kawasaki T, Kindo H, Kohriki T, Konno T, Korpar S, Kri?an P, Kumita T, Lai Y.-T, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa K, Ogawa S, Pestotnik R, ?antelj L, Shoji M, Sumiyoshi T, Tabata M, Tamechika S, Yoshizawa M, Yusa Y

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2019年

  • Belle II aerogel RICH detector 査読

    Burmistrov L, Adachi I, Le Diberder F, Dolenec R, Hataya K, Iijima T, Kakimoto S, Kakuno H, Kawai H, Kawasaki T, Kindo H, Kohriki T, Konno T, Korpar S, Kri?an P, Kumita T, Lai Y, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa K, Ogawa S, Pestotnik R, ?antelj L, Shoji M, Sumiyoshi T, Tabata M, Tamechika S, Yonenaga M, Yoshizawa M, Yusa Y

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2019年

  • Initial performance of the Aerogel RICH detector of the Belle II experiment 査読

    Kindo H, Adachi I, Burmistrov L, Le Diberder F, Hataya K, Kakimimoto S, Kakuno H, Kawai H, Kawasaki T, Konno T, Korpar S, Kri?an P, Kumita T, Lai Y, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa K, Ogawa S, Pestotnik R, antelj L, Sumiyoshi T, Tabata M, Tamechika S, Yonenaga M, Yoshizawa M, Yusa Y

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2019年

  • Front-end electronics of the Belle II aerogel ring imaging detector 査読

    Pestotnik R, Adachi I, Burmistrov L, Le Diberder F, Dolenec R, Hataya K, Kakimoto S, Kakuno H, Kawai H, Kawasaki T, Kindo H, Konno T, Korpar S, Kri?an P, Kumita T, Lai Y, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa K, Ogawa S, antelj L, Sumiyoshi T, Tabata M, Tamechika S, Yonenaga M, Yoshizawa M, Yusa Y

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2019年

  • Development of alignment algorithm for Belle II Aerogel RICH counter 査読

    Tamechika S, Adachi I, Burmistrov L, Le Diberder F, Hataya K, Kakimoto S, Kakuno H, Kawai H, Kawasaki T, Kindo H, Konno T, Korpar S, Kri?an P, Kumita T, Lai Y, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa K, Ogawa S, Pestotnik R, antelj L, Sumiyoshi T, Tabata M, Yonenaga M, Yoshizawa M, Yusa Y

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   2019年

  • Aerogel-Based Ring-Imaging Cherenkov counter in the Belle II experiment 査読

    Lai Y.-T, Adachi I, Burmistrov L, Le Diberder F, Hataya K, Kakimimoto S, Kakuno H, Kawai H, Kawasaki T, Kindo H, Konno T, Korpar S, Krizan P, Kumita T, Machida M, Mrvar M, Nishida S, Nishimura M, Noguchi K, Ogawa K, Ogawa S, Pestotnik R, Santelj L, Sumiyoshi T, Tabata M, Tamechika S, Yonenaga M, Yoshizawa M, Yusa Y

    2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings   2018年

  • The aerogel ring image cherenkov counter for particle identification in the belle II experiment

    Tomoyuki Konno, Ichiro Adachi, Rok Dolenec, Hidekazu Kakuno, Hideyuki Kawai, Haruki Kindo, Samo Korpar, Peter Križan, Tetsuro Kumita, Masahiro Machida, Manca Mrvar, Shohei Nishida, Kouta Noguchi, Kazuya Ogawa, Satoru Ogawa, Rok Pestotnik, Luka Šantelj, Takayuki Sumiyoshi, Makoto Tabata, Masanobu Yonenaga, Morihito Yoshizawa, Yosuke Yusa

    Springer Proceedings in Physics   212   270 - 274   2018年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    The Aerogel Ring Imaging Cherenkov (ARICH) counter is an upgrade of the forward endcap particle identification device in the upcoming Belle II experiment to secure 4σ separation of charged kaons and pions up to momenta of 3.5 GeV. Developments and productions of Silica aerogel radiator, Hybrid Avalanche Photo Detector (HAPD) and its readout electronics, key components of the ARICH counter, are done while surrounding subsystems; a power supply, a readout slow control and a LED light injection system are in operation. And then construction of the ARICH counter is ongoing in parallel to cosmic ray test. Details of the detector components with construction status are described and the test operation are discussed in the letter.

    DOI: 10.1007/978-981-13-1313-4_51

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  • Development of slow control system for the belle II arich counter 査読

    Yonenaga M, Adachi I, Dolenec R, Hataya K, Kakuno H, Kawai H, Kindo H, Konno T, Korpar S, Kri?an P, Kumita T, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa K, Ogawa S, Pestotnik R, antelj L, Sumiyoshi T, Tabata M, Yoshizawa M, Yusa Y

    Springer Proceedings in Physics   212   46 - 49   2018年

  • Behavior of 144ch HAPDS for the Belle II aerogel RICH in the magnetic field 査読

    Ogawa K, Adachi I, Dolenec R, Hataya K, Kakuno H, Kawai H, Kindo H, Konno T, Korpar S, Kri?an P, Kumita T, Machida M, Mrvar M, Nishida S, Noguchi K, Ogawa S, Pestotnik R, antelj L, Sumiyoshi T, Tabata M, Yonenaga M, Yoshizawa M, Yusa Y

    Springer Proceedings in Physics   213   315 - 318   2018年

  • Test of the HAPD light sensor for the Belle II Aerogel RICH 査読

    Y. Yusa, I. Adachi, R. Dolenec, K. Hayata, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, T. Kobayashi, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, R. Pestotnik, L. Santelj, T. Sumiyoshi, M. Tabata, M. Yonenaga

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   149 - 152   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The Aerogel Ring-Imaging Cherenkov detector (ARICH) is being installed in the endcap region of Belle II spectrometer to identify particles from B meson decays by detecting the Cherenkov ring image from aerogel radiators. To detect single photons, high-sensitive photon detector which has wide effective area (similar to 70 mm x 70 mm), a Hybrid Avalanche Photo Detector (HAPD), has been developed in a collaboration with Hamamatsu K.K. The HAPD consists of hybrid structure of a vacuum tube and an avalanche photodiode (APD). It can be operated in 1.5 T magnetic field of the spectrometer and withstands the radiation levels expected in the Belle II experiment. There are two steps of electric pulse amplification: acceleration of photo-electron in electric field in the vacuum tube part and electron avalanche in the APD part resulting in total gain of order 10(5). For the ARICH, we use 420 HAPDs in total. Before installing them, we performed quality assessment studies such as measurements of dark current, noise level, signal-to-noise ratio and two-dimensional scan with laser illumination. We also measured quantum efficiency of the photocathode. During the HAPD performance tests in the magnetic field, we observed very large signal pulses which cause long dead time of the readout electronics in some of the HAPDs. We have carried out a number of studies to understand this phenomenon, and have found a way to mitigate it and suppress the degradation of the ARICH performance. In this report, we will show a summary of the HAPD performance and quality assessment measurements including validation in the magnetic field for all of the HAPDs manufactured for the ARICH in the Belle II.

    DOI: 10.1016/j.nima.2017.02.046

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  • Overview of flavor physics results at Belle 査読

    Yosuke Yusa

    3RD INTERNATIONAL CONFERENCE ON NEW FRONTIERS IN PHYSICS   95   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

    We will present recent topics of the flavor physics in decays of the heavy mesons at the Belle experiment. Most of the results are based on a full data set which corresponds to 772 million B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+) e(-) collider. We also discuss about prospects of the studies in the future B-factory experiment.

    DOI: 10.1051/epjconf/20159504078

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  • Monte Carlo study of a Belle II proximity focusing RICH with aerogel as a radiator 査読

    R. Pestotnik, I. Adachi, N. Hamada, M. Higuchi, T. Iijima, S. Iwata, H. Kakuno, H. Kawai, S. Korpar, P. Krizan, S. Nishida, S. Ogawa, L. Santelj, A. Seljak, T. Sumiyoshi, M. Tabata, E. Tahirovic, K. Yoshida, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   766   270 - 273   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    A proximity focusing RICH will be installed in the forward direction of the Belle II spectrometer, inside a super conducting solenoid coil with the magnetic field of 1.5 T. Photons emitted in the sequence of two different aerogel radiator layers will be registered by the Hybrid Avalanche Photo Diodes. By detecting more than 11 photons per incident 4 GeV/c pion, with 15 mrad single photon Cherenkov angle resolution, the designed detector should enable an efficient separation of kaons from pions in the wide range of particle momenta from 0.5 GeV/c up to 4 GeV/c,
    The particle separation will be based on a two-dimensional extended maximum likelihood analysis. The position dependence of the efficiencies for identification of pions and kaons shows a very homogeneous response over the detector area. The performance on the edge of the detector is improved by employing planar mirrors to reflect the Cherenkov photons on the detector plane. The results show that by using a designed detector configuration the kaon pion separation efficiency of more than 95% can be achieved at a very low pion misidentification probability of 1%. In the low momentum region (0.5 GeV/c-0.8 GeV/c) the variation of detected number of photons due to matching of aerogel refractive index and the gaps between the sensitive areas on the detector plane results in a slightly decreased separation efficiency. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2014.06.064

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    その他リンク: http://orcid.org/0000-0001-6373-2346

  • Observation of the decay B-0 -> eta ' K* (892)(0) 査読

    遊佐 洋右

    PHYSICAL REVIEW D   90 ( 7 )   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.90.072009

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  • Measurement of time-dependent CP violation in B-0 - eta ' K-0 decays 査読

    L. Santelj, Y. Yusa, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, S. Bahinipati, A. M. Bakich, V. Bansalu, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M. Bracko, T. E. Browder, D. T. Cervenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Dolezal, Z. Drasal, A. Drutskoy, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, R. Glattauer, Y. M. Goh, B. Golob, J. Haba, K. Hara, K. Hayasaka, H. Hayashii, X. H. He, T. Higuchi, W. -S. Hou, H. J. Hyun, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, K. K. Joo, H. Kakuno, E. Kato, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Korpar, P. Krizan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, D. Matvienko, K. Miyabayashi, H. Miyata, G. B. Mohanty, A. Moll, T. Mori, E. Nakano, M. Nakao, T. Nanut, Z. Natkaniec, E. Nedelkovska, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, S. L. Olsen, P. Pakhlov, G. Pakhlova, H. Park, T. K. Pedlar, R. Pestotnik, M. Petric, L. E. Piilonen, E. Ribezl, M. Rutter, A. Rostomyan, Y. Sakai, S. Sandilya, T. Sanuki, Y. Sato, V. Savinov, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, K. Senyo, M. E. Sevior, V. Shebalin, C. P. Shen, T. -A. Shibata, J. -G. Shiu, F. Simon, Y. -S. Sohn, A. Sokolov, E. Solovieva, M. Staric, M. Steder, M. Sumihama, U. Tamponi, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, V. Vorobyev, A. Vossen, M. N. Wagner, C. H. Wang, M. -Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, S. Wehle, K. M. Williams, E. Won, S. Yashchenko, Y. Yook, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

    JOURNAL OF HIGH ENERGY PHYSICS   ( 10 )   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    We present a measurement of the time-dependent CP violation parameters in B0 -&gt; eta'K-0 decays. The measurement is based on the full data sample containing 772 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance using the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured values of the mixing-induced and direct CP violation parameters are:
    sin 2 phi(eff)(1) = +0.68 +/- 0.07 +/- 0.03,
    A(eta'K0) = +0.03 +/- 0.05 +/- 0.04,
    where the first uncertainty is statistical arid the second is systernatic. The values obtained are the most accurate to date. lurthierrimore. these results are consistent with our previous measurements and with the world-average value of sin 2 phi(1) measured in B-0 -&gt; J/psi K-0 decays.

    DOI: 10.1007/JHEP10(2014)165

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  • ARICH for Belle II 査読

    Y. Yusa

    JOURNAL OF INSTRUMENTATION   9   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    We report development and current status of Aerogel Ring Imaging Cherenkov counter (ARICH) which is a particle identification detector in the next generation B-factory experiment, the Belle II. The main components of the ARICH are aerogel radiator and photon sensor. When a charged particle goes through the radiator, it emits Cherenkov light photons to the direction which depends on the particle velocity. Combining observables in the Belle II detector, such as a momentum measured with tracker installed inside of the ARICH, and directions of the Cherenkov light photons with the ARICH, we obtain the charged particle mass information. A new photon sensor named Hybrid Avalanche Photon Detector (HAPD) is used to collect a small number of the Cherenkov light photons distributed in the large area effectively. We set up a small part of the ARICH detector and perform the measurement using electron and hadron beam lines at KEK, CERN and DESY. From the obtained results, we expect that it is possible to separate K- and pi-mesons by more than 5 sigma significance level with the ARICH design. The HAPD and its readout electronics production has been started and several kinds of the quality testing for them are ongoing. We also simulate the whole ARICH detector with a GEANT4-based program and expected performance of the particle identification is sufficient for charged tracks in a wide momentum range. After finishing the production of the all components, the construction of the ARICH detector will start in this year and installation to the Belle II detector will be completed in 2015.

    DOI: 10.1088/1748-0221/9/10/C10015

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  • Observation of the decay B0 →η′K∗ (892)0 査読

    Sato S, Yusa Y, Mohanty G.B, Abdesselam A, Adachi I, Aihara H, Al Said S, Asner D.M, Aushev T, Ayad R, Bahinipati S, Bakich A.M, Bansal V, Bhardwaj V, Bhuyan B, Bonvicini G, Bozek A, Bra?ko M, Browder T.E, ?ervenkov D, Chang P, Chekelian V, Chen A, Cheon B.G, Chilikin K, Cho K, Chobanova V, Choi Y, Cinabro D, Dalseno J, Danilov M, Dole?al Z, Dr{\'a}sal Z, Drutskoy A, Eidelman S, Farhat H, Fast J.E, Ferber T, Frost O, Gaur V, Ganguly S, Garmash A, Gillard R, Glattauer R, Goh Y.M, Golob B, Grzymkowska O, Hayasaka K, Hayashii H, He X.H, Higuchi T, Hou W.-S, Huschle M, Iijima T, Inami K, Ishikawa A, Itoh R, Iwasaki Y, Jaegle I, Joo K.K, Julius T, Kato E, Kawasaki T, Kim D.Y, Kim J.B, Kim J.H, Kim K.T, Kim M.J, Kim Y.J, Kinoshita K, Klucar J, Ko B.R, Kody? P, Korpar S, Kri?an P, Krokovny P, Kuhr T, Kumita T, Kwon Y.-J, Li J, Li Y, Libby J, Liventsev D, Matvienko D, Miyabayashi K, Miyata H, Mizuk R, Moll A, Nakano E, Nakao M, Nanut T, Natkaniec Z, Nedelkovska E, Nisar N.K, Nishida S, Ogawa S, Okuno S, Pakhlov P, Pakhlova G, Park H, Pedlar T.K, Petri? M, Piilonen L.E, Ritter M, Rostomyan A, Sakai Y, Sandilya S, Santelj L, Sanuki T, Sato Y, Savinov V, Schneider O, Schnell G, Schwanda C, Schwartz A.J, Semmler D, Senyo K, Seon O, Sevior M.E, Shebalin V, Shen C.P, Shibata T.-A, Shiu J.-G, Shwartz B, Sibidanov A, Simon F, Sohn Y.-S, Sokolov A, Solovieva E, Stari? M, Steder M, Stypula J, Sumihama M, Tamponi U, Tatishvili G, Teramoto Y, Thorne F, Trabelsi K, Uchida M, Uehara S, Uglov T, Unno Y, Uno S, Van Hulse C, Vanhoefer P, Varner G, Vorobyev V, Wagner M.N, Wang C.H, Wang M.-Z, Wang P, Wang X.L, Watanabe M, Watanabe Y, Wehle S, Williams K.M, Won E, Yashchenko S, Yook Y, Zhang Z.P, Zhilich V, Zhulanov V, Zupanc A

    Physical Review D - Particles, Fields, Gravitation and Cosmology   90 ( 7 )   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.90.072009

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    その他リンク: http://orcid.org/0000-0001-6373-2346

  • Development of hybrid avalanche photo detector and its readout electronics for the belle II aerogel RICH counter 査読

    Iwata S, Adachi I, Hara K, Iijima T, Iori S, Kakuno H, Kataura R, Kawai H, Kawasaki T, Kobayashi T, Korpar S, Krizan P, Nishida S, Ogawa S, Pestotnik R, Santelj L, Shoji M, Seljak A, Sumiyoshi T, Tabata M, Tahirovic E, Uchida T, Yoshida K, Yusa Y

    Proceedings of Science   2014年

  • Search for lepton-flavor and lepton-number-violating Τ→ℓhh' decay modes 査読

    Y. Miyazaki, K. Hayasaka, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bay, V. Bhardwaj, B. Bhuyan, M. Bischofberger, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, A. Chen, P. Chen, B. G. Cheon, R. Chistov, K. Cho, Y. Choi, J. Dalseno, Z. Doležal, A. Drutskoy, S. Eidelman, D. Epifanov, J. E. Fast, V. Gaur, N. Gabyshev, A. Garmash, Y. M. Goh, J. Haba, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Julius, J. H. Kang, C. Kiesling, H. J. Kim, H. O. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, B. R. Ko, S. Koblitz, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y. J. Kwon, S. H. Lee, Y. Li, C. L. Lim, C. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, N. Muramatsu, E. Nakano, M. Nakao, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, Y. Onuki, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, M. Petrič, L. E. Piilonen, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, T. Sanuki, Y. Sato, O. Schneider, C. Schwanda, K. Senyo, O. Seon

    Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics   719 ( 4-5 )   346 - 353   2013年2月

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    掲載種別:研究論文(学術雑誌)  

    We search for lepton-flavor and lepton-number-violating. Τ decays into a lepton (ℓ= electron or muon) and two charged mesons (h,h'=π± or K±) using 854 fb<sup>-1</sup> of data collected with the Belle detector at the KEKB asymmetric-energy e<sup>+</sup>e<sup>-</sup> collider. We obtain 90% confidence level upper limits on the. Τ→ℓhh' branching fractions in the range. (2.0-8.4)×10<sup>-8</sup>. These results improve upon our previously published upper limits by factors of about 1.8 on average. © 2013 Elsevier B.V.

    DOI: 10.1016/j.physletb.2013.01.032

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  • Aerogel RICH for forward PID at Belle II 査読

    Pestotnik R, Adachi I, Hara K, Higuchi M, Iijima T, Iwata S, Kakuno H, Kawai H, Kawasaki T, Korpar S, Kri?an P, Kumita T, Mori W, Nishida S, Ogawa S, antelj L, Sakashita Y, Seljak A, Sumiyoshi T, Tabata M, Takagaki H, Yusa Y, Verheyden R

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   732   371 - 374   2013年

  • Progress in the Development of Silica Aerogel as a RICH Radiator in the Belle II Experiment 査読

    Makoto Tabata, Ichiro Adachi, Nao Hamada, Koji Hara, Masahiro Higuchi, Toru Iijima, Shuichi Iwata, Hidekazu Kakuno, Hideyuki Kawai, Takeo Kawasaki, Samo Korpar, Peter Krizan, Tetsuro Kumita, Shohei Nishida, Satoru Ogawa, Rok Pestotnik, Yoshinori Sakashita, Luka Santelj, Andrej Seljak, Takayuki Sumiyoshi, Elvedin Tahirovic, Hitomi Yamami, Keisuke Yoshida, Yosuke Yusa

    2013 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC)   2013年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper describes recent progress in the development of large-area hydrophobic silica aerogel tiles for use as a radiator in the aerogel-based ring-imaging Cherenkov (A-RICH) counter that will be installed in the forward end cap of the Belle II detector. The proximity-focusing A-RICH counter is designed to efficiently identify charged pions and kaons; our goal is a separation capability of more than 4 sigma at momenta up to 4 GeV/c. We plan to fill the large end-cap area of 3.5 m(2) with 124 segmented dual-layer-focusing aerogel combinations with different refractive indices (n similar to 1.05). It is crucial to minimize the number of aerogel tiles to reduce tile boundaries because the number of detected photoelectrons decreases at the boundaries. As a step toward achieving high performance in the actual detector, we performed test productions of large-area (over 18 x 18 x 2 cm(3)) aerogel tiles using both conventional and pin-drying methods. In view of the crack-free production yield, we have decided to mass-produce both upstream and downstream aerogel tiles by the conventional method in the Belle II program, although the pin-dried aerogels showed excellent transparency. We also used an electron beam at DESY to conduct a beam test for investigating the performance of a prototype A-RICH counter. When we used a basic counter configuration with dual-layer-focusing aerogels having n similar to 1.045 and 1.055 produced by the conventional method, we confirmed a pi/K separation capability better than 4 sigma at a momentum of 4 GeV/c.

    DOI: 10.1109/NSSMIC.2013.6829617

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  • Precise Measurement of the CP Violation Parameter sin2 phi(1) in B-0 -&gt; (c(c)over-bar)K-0 Decays 査読

    I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, A. Bay, V. Bhardwaj, B. Bhuyan, M. Bischofberger, A. Bondar, A. Bozek, M. Bracko, T. E. Browder, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, S. -K. Choi, Y. Choi, J. Dalseno, M. Danilov, Z. Dolezal, Z. Drasal, S. Eidelman, D. Epifanov, J. E. Fast, V. Gaur, N. Gabyshev, A. Garmash, Y. M. Goh, B. Golob, J. Haba, K. Hara, T. Hara, K. Hayasaka, H. Hayashii, T. Higuchi, Y. Horii, Y. Hoshi, W. -S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, T. Julius, P. Kapusta, N. Katayama, T. Kawasaki, H. Kichimi, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Koblitz, P. Kodys, S. Korpar, P. Krizan, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. S. Lange, S. -H. Lee, J. Li, Y. Li, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, T. Mori, N. Muramatsu, E. Nakano, M. Nakao, H. Nakazawa, S. Neubauer, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, G. Pakhlova, H. K. Park, K. S. Park, T. K. Pedlar, R. Pestotnik, M. Petric, L. E. Piilonen, A. Poluektov, M. Roehrken, M. Rozanska, H. Sahoo, K. Sakai, Y. Sakai, T. Sanuki, Y. Sato, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, V. Shebalin, C. P. Shen, T. -A. Shibata, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, P. Smerkol, Y. -S. Sohn, A. Sokolov, E. Solovieva, S. Stanic, M. Staric, M. Sumihama, K. Sumisawa, T. Sumiyoshi, S. Tanaka, G. Tatishvili, Y. Teramoto, I. Tikhomirov, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, C. H. Wang, M. -Z. Wang, P. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, H. Yamamoto, Y. Yamashita, M. Yamauchi, Y. Yusa, Z. P. Zhang, V. Zhilich, A. Zupanc, O. Zyukova

    PHYSICAL REVIEW LETTERS   108 ( 17 )   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We present a precise measurement of the CP violation parameter sin2 phi(1) and the direct CP violation parameter A(f) using the final data sample of 772 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is reconstructed in a J / psi K-S(0), psi (2S)K-S(0), chi K-c1(S)0, or J / psi K-L(0) CP eigenstate and its flavor is identified from the decay products of the accompanying B meson. From the distribution of proper-time intervals between the two B decays, we obtain the following CP violation parameters: sin2 phi(1) = 0.667 +/- 0.023(stat) +/- 0.012(syst) and A(f) = 0.006 +/- 0.016(stat) +/- 0.012(syst).

    DOI: 10.1103/PhysRevLett.108.171802

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  • Study of 144-channel multi-anode hybrid avalanche photo-detector for the belle ii rich counter 査読

    Adachi I, Dolenec R, Hara K, Higuchi M, Iijima T, Iwata S, Kakuno H, Kawai H, Kawasaki T, Korpar S, Kri?an P, Kumita T, Nishida S, Mori W, Ogawa S, Pestotnik R, Sakashita Y, Santelj L, Seljak A, Sumiyoshi T, Takagaki H, Tabata M, Yusa Y, Verheyden R

    Proceedings of Science   2012年

  • Development of a RICH counter with 144-ch Hybrid Avalanche Photo-Detectors for the Belle II experiment 査読

    Iwata S, Adachi I, Dolenec R, Hara K, Higuchi M, Iijima T, Kakuno H, Kawai H, Kawasaki T, Korpar S, Krizan P, Kumita T, Nishida S, Mori W, Ogawa S, Pestotnik R, Sakashita Y, Santelj L, Seljak A, Sumiyoshi T, Takagaki H, Tabata M, Yusa Y, Verheyden R

    IEEE Nuclear Science Symposium Conference Record   1490 - 1494   2012年

  • Observation of two charged bottomonium-like resonances

    I. Adachi, K. Adamczyk, H. Aihara, K. Arinstein, Y. Arita, D. M. Asner, T. Aso, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, V. Balagura, Y. Ban, E. Barberio, A. Bay, I. Bedny, M. Belhorn, K. Belous, V. Bhardwaj, B. Bhuyan, M. Bischofberger, S. Blyth, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, J. Brodzicka, O. Brovchenko, T. E. Browder, M. C. Chang, P. Chang, Y. Chao, A. Chen, K. F. Chen, P. Chen, B. G. Cheon, R. Chistov, I. S. Cho, K. Cho, K. S. Choi, S. K. Choi, Y. Choi, J. Crnkovic, J. Dalseno, M. Danilov, A. Das, Z. Doležal, Z. Drásal, A. Drutskoy, Y. T. Duh, W. Dungel, D. Dutta, S. Eidelman, D. Epifanov, S. Esen, J. E. Fast, M. Feindt, M. Fujikawa, V. Gaur, N. Gabyshev, A. Garmash, Y. M. Goh, B. Golob, M. Grosse Perdekamp, H. Guo, H. Ha, J. Haba, Y. L. Han, K. Hara, T. Hara, Y. Hasegawa, K. Hayasaka, H. Hayashii, D. Heffernan, T. Higuchi, C. T. Hoi, Y. Horii, Y. Hoshi, K. Hoshina, W. S. Hou, Y. B. Hsiung, C. L. Hsu, H. J. Hyun, Y. Igarashi, T. Iijima, M. Imamura, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, M. Iwasaki, Y. Iwasaki, T. Iwashita, S. Iwata, I. Jaegle, M. Jones, N. J. Joshi, T. Julius, H. Kakuno, J. H. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, S. H. Kim, S. K. Kim, T. Y. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Koblitz, P. Kodyš, Y. Koga, S. Korpar, R. T. Kouzes, M. Kreps, P. Križan, T. Kuhr, R. Kumar, T. Kumita, E. Kurihara, Y. Kuroki, A. Kuzmin, P. Kvasnička, Y. J. Kwon, S. H. Kyeong, J. S. Lange, I. S. Lee, M. J. Lee, S. E. Lee, S. H. Lee, M. Leitgab, R. Leitner, J. Li, Y. Li, J. Libby, C. L. Lim, A. Limosani, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, J. MacNaughton, D. Marlow, A. Matyja, S. McOnie, T. Medvedeva, Y. Mikami, M. Nayak, K. Miyabayashi, Y. Miyachi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, D. Mohapatra, A. Moll, T. Mori, T. Müller, N. Muramatsu, R. Mussa, T. Nagamine, Y. Nagasaka, Y. Nakahama, I. Nakamura, E. Nakano, T. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, Z. Natkaniec, E. Nedelkovska, K. Neichi, S. Neubauer, C. Ng, M. Niiyama, S. Nishida, K. Nishimura, O. Nitoh, S. Noguchi, T. Nozaki, A. Ogawa, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, H. K. Park, K. S. Park, L. S. Peak, T. K. Pedlar, T. Peng, R. Pestotnik, M. Peters, M. Petrič, L. E. Piilonen, A. Poluektov, M. Prim, K. Prothmann, B. Reisert, M. Ritter, M. Röhrken, J. Rorie, M. Rozanska, S. Ryu, H. Sahoo, K. Sakai, Y. Sakai, D. Santel, N. Sasao, O. Schneider, P. Schönmeier, C. Schwanda, A. J. Schwartz, R. Seidl, A. Sekiya, K. Senyo, O. Seon, M. E. Sevior, L. Shang, M. Shapkin, V. Shebalin, C. P. Shen, T. A. Shibata, H. Shibuya, S. Shinomiya, J. G. Shiu, B. Shwartz, F. Simon, J. B. Singh, R. Sinha, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, J. Stypula, S. Sugihara, A. Sugiyama, M. Sumihama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, H. Takeichi, M. Tanaka, S. Tanaka, N. Taniguchi, G. Tatishvili, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, Y. F. Tse, T. Tsuboyama, Y. W. Tung, M. Uchida, T. Uchida, Y. Uchida, S. Uehara, K. Ueno, T. Uglov, M. Ullrich, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, S. E. Vahsen, P. Vanhoefer, G. Varner, K. E. Varvell, K. Vervink, A. Vinokurova, A. Vossen, C. H. Wang, J. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, R. Wedd, M. Werner, E. White, J. Wicht, L. Widhalm, J. Wiechczynski, K. M. Williams, E. Won, T. Y. Wu, B. D. Yabsley, H. Yamamoto, J. Yamaoka, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Y. Yusa, D. Zander, C. C. Zhang, L. M. Zhang, Z. P. Zhang, L. Zhao, V. Zhilich, P. Zhou, V. Zhulanov, T. Zivko, A. Zupanc, N. Zwahlen, O. Zyukova

    Proceedings of the 9th International Conference on Flavor Physics and CP Violation, FPCP 2011   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Tel Aviv University  

    We report the observation of two narrow structures at 10610 MeV/c 2 and 10650 MeV/c2 in the π ±γ(nS) (n = 1,2,3) and π±hb(mP) (m = 1,2) mass spectra that are produced in association with a single charged pion in γ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M1 = 10608.4 ± 2.0MeV/c2, γ1 = 15.6 ± 2.5 MeV and M 2 = 10653.2 ± 1.5 MeV/c2, γ2 = 14.4 ±3.2 MeV. Analysis favors quantum numbers of IG(J P)=1+(1+) for both states. The results are obtained with a 121.4 fb-1 data sample collected with the Belle detector near the γ(5S) resonance at the KEKB asymmetric-energy e+e- collider.

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  • Measurement of CP asymmetries in B-0 -&gt; K-0 pi(0) decays 査読

    M. Fujikawa, Y. Yusa, J. Dalseno, M. Hazumi, K. Sumisawa, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, V. Balagura, E. Barberio, K. Belous, V. Bhardwaj, M. Bischofberger, A. Bondar, A. Bozek, M. Bracko, T. E. Browder, Y. Chao, A. Chen, B. G. Cheon, S. -K. Choi, Y. Choi, W. Dungel, S. Eidelman, M. Feindt, P. Goldenzweig, H. Ha, J. Haba, B. -Y. Han, K. Hara, Y. Hasegawa, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. -S. Hou, H. J. Hyun, T. Iijima, K. Inami, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, T. Julius, J. H. Kang, H. Kawai, C. Kiesling, H. O. Kim, S. K. Kim, Y. I. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Korpar, M. Kreps, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, Y. -J. Kwon, S. -H. Kyeong, S. -H. Lee, J. Li, C. Liu, D. Liventsev, R. Louvot, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, T. Mori, Y. Nagasaka, E. Nakano, M. Nakao, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, R. Pestotnik, L. E. Piilonen, M. Rozanska, Y. Sakai, O. Schneider, A. J. Schwartz, K. Senyo, M. Shapkin, V. Shebalin, C. P. Shen, J. -G. Shiu, J. B. Singh, A. Sokolov, E. Solovieva, S. Stanic, M. Staric, T. Sumiyoshi, G. N. Taylor, Y. Teramoto, K. Trabelsi, S. Uehara, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. Vervink, A. Vinokurova, C. H. Wang, P. Wang, Y. Watanabe, R. Wedd, E. Won, B. D. Yabsley, Y. Yamashita, C. C. Zhang, Z. P. Zhang, A. Zupanc

    PHYSICAL REVIEW D   81 ( 1 )   2010年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We report measurements of CP violation parameters in B-0 -&gt; K-0 pi(0) decays based on a data sample of 657 X 10(6)B (B) over bar pairs collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. We use B-0 -&gt; K-S(0)pi(0) decays for both mixing-induced and direct CP violating asymmetry measurements and B-0 -&gt; K-L(0)pi(0) decays for the direct CP violation measurement. The CP violation parameters obtained are sin2 phi(eff)(1) - +0.67 +/- 0.31(stat) +/- 0.08(syst) and A(K0 pi 0) - +0.14 +/- 0.13(stat) +/- 0.06(syst). The branching fraction of B-0 -&gt; K-0 pi(0) decay is measured to be B(B-0 -&gt; K-0 pi(0)) - (8.7 +/- 0.5(stat) +/- 0.6(syst)) X 10(-6). The observed A(K0 pi 0) value differs by 1.9 standard deviations from the value expected from an isospin sum rule.

    DOI: 10.1103/PhysRevD.81.011101

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  • Measurement of CP asymmetries in B0→K0π0 decays 査読

    M. Fujikawa, Y. Yusa, J. Dalseno, M. Hazumi, K. Sumisawa, t. al, Belle Collaboation

    Physical Review D - Particles, Fields, Gravitation and Cosmology   81   2010年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report measurements of CP violation parameters in B0→K0π0 decays based on a data sample of 657×106BB̄ pairs collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. We use B0→KS0π0 decays for both mixing-induced and direct CP violating asymmetry measurements and B0→KL0π0 decays for the direct CP violation measurement. The CP violation parameters obtained are sin 2 1eff=+0.67±0. 31(stat)±0.08(syst) and AK0π0=+0.14±0.13(stat)±0. 06(syst). The branching fraction of B0→K0π0 decay is measured to be B(B0→K0π0)=(8.7±0.5(stat.)±0.6(syst.))×10 -6. The observed AK0π0 value differs by 1.9 standard deviations from the value expected from an isospin sum rule. © 2010 The American Physical Society.

    DOI: 10.1103/PhysRevD.81.011101

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  • Belle muon identification 査読

    Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   598 ( 1 )   183 - 186   2009年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    In this report, we describe the K(L)(0) and muon identification subsystem of the BELLE experiment at the KEKB e(+)e(-) asymmetric collider. The system consists of resistive plate counter (RPC) charged particle detector installed within the segmented flux return iron yoke of the BELLE superconducting solenoid. Upgrade plan for high luminosity B-factory experiment is also discussed. Published by Elsevier B.V.

    DOI: 10.1016/j.nima.2008.08.108

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  • Observation of time-dependent CP violation in B-0 -&gt;eta K-'(0) decays and improved measurements of CP asymmetries in B-0 -&gt;phi K-0, (KSKSKS0)-K-0-K-0 and B-0 -&gt; J/psi K-0 decays 査読

    K. -F. Chen, K. Hara, M. Hazumi, T. Higuchi, K. Miyabayashi, Y. Nakahama, K. Sumisawa, O. Tajima, Y. Ushiroda, Y. Yusa, K. Abe, K. Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, V. Balagura, S. Banerjee, E. Barberio, M. Barbero, A. Bay, K. Belous, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. Bracko, J. Brodzicka, T. E. Browder, P. Chang, Y. Chao, A. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. -K. Choi, Y. Choi, Y. K. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Danilov, M. Dash, J. Dragic, A. Drutskoy, S. Eidelman, D. Epifanov, S. Fratina, A. Garmash, T. Gershon, A. Go, G. Gokhroo, P. Goldenzweig, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, D. Heffernan, T. Hokuue, Y. Hoshi, S. Hou, W. -S. Hou, Y. B. Hsiung, T. Iijima, K. Ikado, A. Imoto, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kakuno, J. H. Kang, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, H. J. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, P. Krizan, P. Krokovny, R. Kulasiri, R. Kumar, C. C. Kuo, A. Kusaka, A. Kuzmin, Y. -J. Kwon, G. Leder, J. Lee, M. J. Lee, T. Lesiak, J. Li, A. Limosani, S. -W. Lin, Y. Liu, D. Liventsev, G. Majumder, F. Mandl, T. Matsumoto, A. Matyja, W. Mitaroff, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, D. Mohapatra, G. R. Moloney, A. Murakami, T. Nagamine, Y. Nagasaka, I. Nakamura, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, H. Park, R. Pestotnik, L. E. Piilonen, H. Sahoo, Y. Sakai, N. Satoyama, T. Schietinger, O. Schneider, J. Schumann, A. J. Schwartz, R. Seidl, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, B. Shwartz, J. B. Singh, A. Sokolov, A. Somov, S. Stanic, M. Staric, H. Stoeck, T. Sumiyoshi, S. Suzuki, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. -Z. Wang, Y. Watanabe, R. Wedd, E. Won, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, C. C. Zhang, Z. P. Zhang, V. Zhilich, A. Zupanc

    PHYSICAL REVIEW LETTERS   98 ( 3 )   2007年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    We present improved measurements of CP-violation parameters in B-0 -&gt; phi K-0, eta K-'(0), (KSKSKS0)-K-0-K-0 decays based on a sample of 535 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We obtain sin2 phi(eff)(1) = +0.64 +/- 0.10(stat) +/- 0.04(syst) for B-0 -&gt; eta K-'(0), +0.50 +/- 0.21(stat) +/- 0.06(syst) for B-0 -&gt;phi K-0, and +0.30 +/- 0.32(stat) +/- 0.08(syst) for B-0 -&gt; (KSKSKS0)-K-0-K-0 decays. We have observed CP violation in the B-0 -&gt; eta K-'(0) decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B-0 -&gt; J/psi K-0 decays and obtain sin2 phi(1) = +0.642 +/- 0.031(stat) +/- 0.017(syst).

    DOI: 10.1103/PhysRevLett.98.031802

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  • Precise measurement of hadronic τ-decays in modes with η mesons

    K. Abe, I. Adachi, H. Aihara, K. Arinstein, T. Aso, V. Aulchenko, T. Aushev, T. Aziz, S. Bahinipati, A. M. Bakich, V. Balagura, Y. Ban, S. Banerjee, E. Barberio, A. Bay, I. Bedny, K. Belous, V. Bhardwaj, U. Bitenc, S. Blyth, A. Bondar, A. Bozek, M. Bracko, J. Brodzicka, T. E. Browder, M. C. Chang, P. Chang, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, C. C. Chiang, R. Chistov, I. S. Cho, S. K. Choi, Y. Choi, Y. K. Choi, S. Cole, J. Dalseno, M. Danilov, A. Das, M. Dash, J. Dragic, A. Drutskoy, S. Eidelman, D. Epifanov, S. Fratina, H. Fujii, M. Fujikawa, N. Gabyshev, A. Garmash, A. Go, G. Gokhroo, P. Goldenzweig, B. Golob, M. Grosse Perdekamp, H. Guler, H. Ha, J. Haba, K. Hara, T. Hara, Y. Hasegawa, N. C. Hastings, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Higuchi, L. Hinz, H. Hoedlmoser, T. Hokuue, Y. Horii, Y. Hoshi, K. Hoshina, S. Hou, W. S. Hou, Y. B. Hsiung, H. J. Hyun, Y. Igarashi, T. Iijima, K. Ikado, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwabuchi, M. Iwasaki, Y. Iwasaki, C. Jacoby, N. J. Joshi, M. Kaga, D. H. Kah, H. Kaji, S. Kajiwara, H. Kakuno, J. H. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, A. Kibayashi, H. Kichimi, H. J. Kim, H. O. Kim, J. H. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, Y. Kozakai, P. Krizan, P. Krokovny, R. Kumar, E. Kurihara, A. Kusaka, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, J. Lee, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, Y. Liu, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsumura, A. Matyja, S. McOnie, T. Medvedeva, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, T. Mori, J. Mueller, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nakahama, I. Nakamura, E. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, Z. Natkaniec, K. Neichi, S. Nishida, K. Nishimura, Y. Nishio, I. Nishizawa, O. Nitoh, S. Noguchi, T. Nozaki, A. Ogawa, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, S. Ono, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, K. S. Park, N. Parslow, L. S. Peak, M. Pernicka, R. Pestotnik, M. Peters, L. E. Piilonen, A. Poluektov, J. Rorie, M. Rozanska, H. Sahoo, Y. Sakai, H. Sakamoto, H. Sakaue, T. R. Sarangi, N. Satoyama, K. Sayeed, T. Schietinger, O. Schneider, P. Schönmeier, J. Schümann, C. Schwanda, A. J. Schwartz, R. Seidl, A. Sekiya, K. Senyo, M. E. Sevior, L. Shang, M. Shapkin, C. P. Shen, H. Shibuya, S. Shinomiya, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, E. Solovieva, A. Somov, S. Stanic, M. Staric, J. Stypula, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, N. Taniguchi, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, Y. F. Tse, T. Tsuboyama, K. Uchida, Y. Uchida, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, G. Varner, K. E. Varvell, K. Vervink, S. Villa, A. Vinokurova, C. C. Wang, C. H. Wang, J. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, R. Wedd, J. Wicht, L. Widhalm, J. Wiechczynski, E. Won, B. D. Yabsley, A. Yamaguchi, H. Yamamoto, M. Yamaoka, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Y. Yusa, C. C. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc, N. Zwahlen

    23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    We have measured branching fractions of hadronic τdecays involving an η meson using 485 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the following branching fractions: B(τ - → K-ην) = (1.62 ± 0.05 ± 0.09) × 10-4, B(τ - → K-η0π=ηντ ) = (4.7 ± 1.1 ± 0.4) × 10-5, B(τ - → π-π0ηντ ) = (1.39 ± 0.03 ± 0.07) × 10-3, and B(τ - → K-ην7tau
    ) = (1.13 ±0.19 ± 0.07) ×10-4 improving the accuracy compared to the best previous measurements by factors of six, eight, four and four, respectively.

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  • Search for B̄0 → Λ + cΛ ̄̄cdecay at Belle

    K. Abe, I. Adachi, H. Aihara, K. Arinstein, T. Aso, V. Aulchenko, T. Aushev, T. Aziz, S. Bahinipati, A. M. Bakich, V. Balagura, Y. Ban, S. Banerjee, E. Barberio, A. Bay, I. Bedny, K. Belous, V. Bhardwaj, U. Bitenc, S. Blyth, A. Bondar, A. Bozek, M. Bracko, J. Brodzicka, T. E. Browder, M. C. Chang, P. Chang, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, C. C. Chiang, R. Chistov, I. S. Cho, S. K. Choi, Y. Choi, Y. K. Choi, S. Cole, J. Dalseno, M. Danilov, A. Das, M. Dash, J. Dragic, A. Drutskoy, S. Eidelman, D. Epifanov, S. Fratina, H. Fujii, M. Fujikawa, N. Gabyshev, A. Garmash, A. Go, G. Gokhroo, P. Goldenzweig, B. Golob, M. Grosse Perdekamp, H. Guler, H. Ha, J. Haba, K. Hara, T. Hara, Y. Hasegawa, N. C. Hastings, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Higuchi, L. Hinz, H. Hoedlmoser, T. Hokuue, Y. Horii, Y. Hoshi, K. Hoshina, S. Hou, W. S. Hou, Y. B. Hsiung, H. J. Hyun, Y. Igarashi, T. Iijima, K. Ikado, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwabuchi, M. Iwasaki, Y. Iwasaki, C. Jacoby, N. J. Joshi, M. Kaga, D. H. Kah, H. Kaji, S. Kajiwara, H. Kakuno, J. H. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, A. Kibayashi, H. Kichimi, H. J. Kim, H. O. Kim, J. H. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, Y. Kozakai, P. Krizan, P. Krokovny, R. Kumar, E. Kurihara, A. Kusaka, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, J. Lee, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, Y. Liu, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsumura, A. Matyja, S. McOnie, T. Medvedeva, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, T. Mori, J. Mueller, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nakahama, I. Nakamura, E. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, Z. Natkaniec, K. Neichi, S. Nishida, K. Nishimura, Y. Nishio, I. Nishizawa, O. Nitoh, S. Noguchi, T. Nozaki, A. Ogawa, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, S. Ono, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, K. S. Park, N. Parslow, L. S. Peak, M. Pernicka, R. Pestotnik, M. Peters, L. E. Piilonen, A. Poluektov, J. Rorie, M. Rozanska, H. Sahoo, Y. Sakai, H. Sakamoto, H. Sakaue, T. R. Sarangi, N. Satoyama, K. Sayeed, T. Schietinger, O. Schneider, P. Schönmeier, J. Schümann, C. Schwanda, A. J. Schwartz, R. Seidl, A. Sekiya, K. Senyo, M. E. Sevior, L. Shang, M. Shapkin, C. P. Shen, H. Shibuya, S. Shinomiya, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, E. Solovieva, A. Somov, S. Stanic, M. Staric, J. Stypula, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, N. Taniguchi, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, Y. F. Tse, T. Tsuboyama, K. Uchida, Y. Uchida, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, G. Varner, K. E. Varvell, K. Vervink, S. Villa, A. Vinokurova, C. C. Wang, C. H. Wang, J. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, R. Wedd, J. Wicht, L. Widhalm, J. Wiechczynski, E. Won, B. D. Yabsley, A. Yamaguchi, H. Yamamoto, M. Yamaoka, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Y. Yusa, C. C. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc, N. Zwahlen

    23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    We search for the doubly charmed baryonic decay B̄0 → Λ + cΛ ̄̄cin a data sample of 520 × 106 B ̄B events accumulated at the γ(4S) resonance with the Belle detector at the KEKB asymmetricenergy e+e- collider. We find no significant signal and set an upper limit of B B̄0 → Λ + cΛ ̄̄c) 6.2 × 10-5 at 90% confidence level. The result is significantly below a naive extrapolation fromB(B̄→ Ε0c̄ Λc ) assuming a simple Cabibbo-suppression factor of |Vcd/Vcs|2. The small branching fraction could be attributed to a suppression due to the large momentum of the baryonic decay products, which has been observed in other charmed baryonic two-body B decays.

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  • Search for lepton flavor violating τ → ℓv 0 decays at Belle

    K. Abe, I. Adachi, H. Aihara, K. Arinstein, T. Aso, V. Aulchenko, T. Aushev, T. Aziz, S. Bahinipati, A. M. Bakich, V. Balagura, Y. Ban, S. Banerjee, E. Barberio, A. Bay, I. Bedny, K. Belous, V. Bhardwaj, U. Bitenc, S. Blyth, A. Bondar, A. Bozek, M. Bracko, J. Brodzicka, T. E. Browder, M. C. Chang, P. Chang, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, C. C. Chiang, R. Chistov, I. S. Cho, S. K. Choi, Y. Choi, Y. K. Choi, S. Cole, J. Dalseno, M. Danilov, A. Das, M. Dash, J. Dragic, A. Drutskoy, S. Eidelman, D. Epifanov, S. Fratina, H. Fujii, M. Fujikawa, N. Gabyshev, A. Garmash, A. Go, G. Gokhroo, P. Goldenzweig, B. Golob, M. Grosse Perdekamp, H. Guler, H. Ha, J. Haba, K. Hara, T. Hara, Y. Hasegawa, N. C. Hastings, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Higuchi, L. Hinz, H. Hoedlmoser, T. Hokuue, Y. Horii, Y. Hoshi, K. Hoshina, S. Hou, W. S. Hou, Y. B. Hsiung, H. J. Hyun, Y. Igarashi, T. Iijima, K. Ikado, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwabuchi, M. Iwasaki, Y. Iwasaki, C. Jacoby, N. J. Joshi, M. Kaga, D. H. Kah, H. Kaji, S. Kajiwara, H. Kakuno, J. H. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, A. Kibayashi, H. Kichimi, H. J. Kim, H. O. Kim, J. H. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, Y. Kozakai, P. Krizan, P. Krokovny, R. Kumar, E. Kurihara, A. Kusaka, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, J. Lee, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, Y. Liu, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsumura, A. Matyja, S. McOnie, T. Medvedeva, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, T. Mori, J. Mueller, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nakahama, I. Nakamura, E. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, Z. Natkaniec, K. Neichi, S. Nishida, K. Nishimura, Y. Nishio, I. Nishizawa, O. Nitoh, S. Noguchi, T. Nozaki, A. Ogawa, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, S. Ono, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, K. S. Park, N. Parslow, L. S. Peak, M. Pernicka, R. Pestotnik, M. Peters, L. E. Piilonen, A. Poluektov, J. Rorie, M. Rozanska, H. Sahoo, Y. Sakai, H. Sakaue, N. Sasao, T. R. Sarangi, N. Satoyama, K. Sayeed, T. Schietinger, O. Schneider, P. Schönmeier, J. Schümann, C. Schwanda, A. J. Schwartz, R. Seidl, A. Sekiya, K. Senyo, M. E. Sevior, L. Shang, M. Shapkin, C. P. Shen, H. Shibuya, S. Shinomiya, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, E. Solovieva, A. Somov, S. Stanic, M. Staric, J. Stypula, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, N. Taniguchi, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, Y. F. Tse, T. Tsuboyama, K. Uchida, Y. Uchida, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, G. Varner, K. E. Varvell, K. Vervink, S. Villa, A. Vinokurova, C. C. Wang, C. H. Wang, J. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, R. Wedd, J. Wicht, L. Widhalm, J. Wiechczynski, E. Won, B. D. Yabsley, A. Yamaguchi, H. Yamamoto, M. Yamaoka, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Y. Yusa, C. C. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc, N. Zwahlen

    23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    We have searched for neutrinoless τ lepton decays into ℓ and V 0, where ℓ stands for an electron or muon, and V 0 for a vector meson (φ, ω, K*0 or ̄K* 0), using 543 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No excess of signal events over the expected background is observed, and we set upper limits on the branching fractions in the range (0.7- 1.8) ×10-7 at the 90% confidence level. These upper limits include the first results for ℓω as well as new limits that are 3.6 - 9.6 times more restrictive than our previous results for ℓφ, ℓKπ and ℓ ̄K *0.

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  • Search for lepton flavor violating τ decays into three leptons 査読

    Abe K, Adachi I, Aihara H, Arinstein K, Aso T, Aulchenko V, Aushev T, Aziz T, Bahinipati S, Bakich A.M, Balagura V, Ban Y, Banerjee S, Barberio E, Bay A, Bedny I, Belous K, Bhardwaj V, Bitenc U, Blyth S, Bondar A, Bozek A, Bracko M, Brodzicka J, Browder T.E, Chang M.-C, Chang P, Chao Y, Chen A, Chen K.-F, Chen W.T, Cheon B.G, Chiang C.-C, Chistov R, Cho I.-S, Choi S.-K, Choi Y, Choi Y.K, Cole S, Dalseno J, Danilov M, Das A, Dash M, Dragic J, Drutskoy A, Eidelman S, Epifanov D, Fratina S, Fujii H, Fujikawa M, Gabyshev N, Garmash A, Go A, Gokhroo G, Goldenzweig P, Golob B, Grosse Perdekamp M, Guler H, Ha H, Haba J, Hara K, Hara T, Hasegawa Y, Hastings N.C, Hayasaka K, Hayashii H, Hazumi M, Heffernan D, Higuchi T, Hinz L, Hoedlmoser H, Hokuue T, Horii Y, Hoshi Y, Hoshina K, Hou S, Hou W.-S, Hsiung Y.B, Hyun H.J, Igarashi Y, Iijima T, Ikado K, Inami K, Ishikawa A, Ishino H, Itoh R, Iwabuchi M, Iwasaki M, Iwasaki Y, Jacoby C, Joshi N.J, Kaga M, Kah D.H, Kaji H, Kajiwara S, Kakuno H, Kang J.H, Kapusta P, Kataoka S, U, Katayama N, Kawai H, Kawasaki T, Kibayashi A, Kichimi H, Kim H.J, Kim H.O, Kim J.H, Kim S.K, Kim Y.J, Kinoshita K, Korpar S, Kozakai Y, Krizan P, Krokovny P, Kumar R, Kurihara E, Kusaka A, Kuzmin A, Kwon Y.-J, Lange J.S, Leder G, Lee J, Lee J.S, Lee M.J, Lee S.E, Lesiak T, Li J, Limosani A, Lin S.-W, Liu Y, Liventsev D, MacNaughton J, Majumder G, Mandl F, Marlow D, Matsumura T, Matyja A, McOnie S, Medvedeva T, Mikami Y, Mitaroff W, Miyabayashi K, Miyake H, Miyata H, Miyazaki Y, Mizuk R, Moloney G.R, Mori T, Mueller J, Murakami A, Nagamine T, Nagasaka Y, Nakahama Y, Nakamura I, Nakano E, Nakao M, Nakayama H, Nakazawa H, Natkaniec Z, Neichi K, Nishida S, Nishimura K, Nishio Y, Nishizawa I, Nitoh O, Noguchi S, Nozaki T, Ogawa A, Ogawa S, Ohshima T, Okuno S, Olsen S.L, Ono S, Ostrowicz W, Ozaki H, Pakhlov P, Pakhlova G, Palka H, Park C.W, Park H, Park K.S, Parslow N, Peak L.S, Pernicka M, Pestotnik R, Peters M, Piilonen L.E, Poluektov A, Rorie J, Rozanska M, Sahoo H, Sakai Y, Sakaue H, Sasao N, Sarangi T.R, Satoyama N, Sayeed K, Schietinger T, Schneider O, Sch{\"o}nmeier P, Sch{\"u}mann J, Schwanda C, Schwartz A.J, Seidl R, Sekiya A, Senyo K, Sevior M.E, Shang L, Shapkin M, Shen C.P, Shibuya H, Shinomiya S, Shiu J.-G, Shwartz B, Singh J.B, Sokolov A, Solovieva E, Somov A, Stanic S, Staric M, Stypula J, Sugiyama A, Sumisawa K, Sumiyoshi T, Suzuki S, Suzuki S.Y, Tajima O, Takasaki F, Tamai K, Tamura N, Tanaka M, Taniguchi N, Taylor G.N, Teramoto Y, Tikhomirov I, Trabelsi K, Tse Y.F, Tsuboyama T, Uchida K, Uchida Y, Uehara S, Ueno K, Uglov T, Unno Y, Uno S, Urquijo P, Ushiroda Y, Usov Y, Varner G, Varvell K.E, Vervink K, Villa S, Vinokurova A, Wang C.C, Wang C.H, Wang J, Wang M.-Z, Wang P, Wang X.L, Watanabe M, Watanabe Y, Wedd R, Wicht J, Widhalm L, Wiechczynski J, Won E, Yabsley B.D, Yamaguchi A, Yamamoto H, Yamaoka M, Yamashita Y, Yamauchi M, Yuan C.Z, Yusa Y, Zhang C.C, Zhang L.M, Zhang Z.P, Zhilich V, Zhulanov V, Zupanc A, Zwahlen N

    23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007   2007年

  • Search for neutrinoless decays tau -&gt; lhh and tau -&gt; lV(0) 査読

    Y. Yusa, K. Abe, K. Abe, I. Adachi, H. Aihara, Y. Asano, V. Aulchenko, A. Bay, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, T. E. Browder, A. Chen, B. G. Cheon, R. Chistov, Y. Choi, Y. K. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Dash, A. Drutskoy, S. Eidelman, S. Fratina, N. Gabyshev, T. Gershon, G. Gokhroo, A. Gorisek, H. C. Ha, J. Haba, K. Hayasaka, H. Hayashii, M. Hazumi, Y. Hoshi, W. -S. Hou, T. Iijima, K. Ikado, K. Inami, R. Itoh, M. Iwasaki, Y. Iwasaki, J. H. Kang, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, S. K. Kim, S. Korpar, P. Krizan, R. Kulasiri, C. C. Kuo, A. Kuzmin, Y. J. Kwon, T. Lesiak, S. -W. Lin, D. Liventsev, G. Majumder, T. Matsumoto, W. Mitaroff, Y. Miyazaki, R. Mizuk, T. Nagamine, E. Nakano, Z. Natkaniec, S. Nishida, S. Ogawa, T. Ohshima, T. Okabe, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, H. Palka, R. Pestotnik, L. E. Piilonen, Y. Sakai, N. Sato, T. Schietinger, O. Schneider, C. Schwanda, R. Seidl, K. Senyo, M. Shapkin, H. Shibuya, B. Shwartz, A. Sokolov, A. Somov, N. Soni, R. Stamen, S. Stanic, M. Staric, K. Sumisawa, O. Tajima, F. Takasaki, K. Tamai, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, T. Tsukamoto, S. Uehara, S. Uno, Y. Usov, G. Varner, S. Villa, E. Won, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, Z. P. Zhang

    PHYSICS LETTERS B   640 ( 4 )   138 - 144   2006年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have searched for neutrinoless tau lepton decays into lhh or lV(0), where l stands for an electron or muon, h for a charged light hadron, pi or K, and V-0 for a neutral vector meson, rho(0), K*(892)(0) and phi, using a 158 fb(-1) data sample collected with the Belle detector at the KEKB e(+)e(-) collider. Since the number of events observed are consistent with the expected background, we set upper limits on the branching fractions in the range of (1.6-8.0) x 10(-7) for various decay modes at the 90% confidence level. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physletb.2006.07.025

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  • Search for neutrinoless decays tau -&gt; lhh 査読

    Y Yusa

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   144   173 - 178   2005年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have searched for neutrinoless &tau; lepton decays into one electron or muon and two charged pion or kaon using a 158 fb(-1) data sample collected with the Belle detector at the KEKB e(+) e(-) collider. Since the number of signal candidate events is compatible with the expected background, we set 90% confidence level upper limits on the branching fractions in the range (2.2 - 15.5) x 10(-7) for various decay modes &tau; &RARR; lhh where l and h represent e or &mu; and &pi;(&PLUSMN;) or K-&PLUSMN;, respectively.

    DOI: 10.1016/j.nuclphysbps.2005.02.024

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  • Search for neutrinoless decays iota -&gt; 3l 査読

    Y Yusa, T Nagamine, A Yamaguchi, K Abe, K Abe, T Abe, Adachi, I, H Aihara, M Akatsu, Y Asano, Aulchenko, V, T Aushev, S Bahinipati, AM Bakich, E Banas, Bedny, I, U Bitenc, Bizjak, I, A Bondar, A Bozek, M Bracko, TE Browder, MC Chang, BG Cheon, R Chistov, Y Choi, A Chuvikov, M Danilov, LY Dong, S Eidelman, Eiges, V, Y Enari, S Fratina, N Gabyshev, A Garmash, T Gershon, G Gokhroo, B Golob, J Haba, H Hayashii, M Hazumi, L Hinz, T Hokuue, Y Hoshi, WS Hou, Iijima, I, K Inami, A Ishikawa, R Itoh, H Iwasaki, M Iwasaki, JH Kang, JS Kang, P Kapusta, N Katayama, H Kawai, T Kawasaki, H Kichimi, HO Kim, P Koppenburg, S Korpar, P Krizan, P Krokovny, A Kuzmin, YJ Kwon, SH Lee, T Lesiak, J Li, SW Lin, J MacNaughton, T Matsumoto, A Matyja, Y Mikami, W Mitaroff, H Miyata, D Mohapatra, GR Moloney, T Mori, Y Nagasaka, E Nakano, M Nakao, H Nakazawa, Z Natkaniec, S Nishida, O Nitoh, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, SL Olsen, W Ostrowicz, H Ozaki, P Pakhlov, H Palka, H Park, KS Park, N Parslow, JP Perroud, LE Piilonen, A Poluektov, N Root, H Sagawa, S Saitoh, Y Sakai, TR Sarangi, O Schneider, AJ Schwartz, S Semenov, K Senyo, ME Sevior, H Shibuya, B Shwartz, JB Singh, N Soni, S Stanic, M Staric, K Sumisawa, T Sumiyoshi, S Suzuki, O Tajima, R Takasaki, K Tamai, N Tamura, M Tanaka, Y Teramoto, T Tomura, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, Y Unno, S Uno, G Varner, CC Wang, CH Wang, Y Yamada, Y Yamashita, M Yamauchi, H Yanai, J Zhang, ZP Zhang, Zhilich, V, T Ziegler, D Zontar

    PHYSICS LETTERS B   589 ( 3-4 )   103 - 110   2004年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have searched for neutrinoless tau lepton decays into three charged leptons using an 87.1 fb(-1) data sample collected with the Belle detector at the KEKB e(+)e(-) collider. Since the number of signal candidate events is compatible with that expected from the background, we set 90% confidence level upper limits on the branching fractions in the range (1.9-3.5) x 10(-7) for various decay modes tau(-) --&gt; l(-)l(+)l(-) where l represents e or mu. (C) 2004 Published by Elsevier B.V.

    DOI: 10.1016/j.physletb.2004.04.002

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  • Observation of Radiative [Formula presented] Decays

    A. Drutskoy, K. Abe, K. Abe, T. Abe, H. Aihara, M. Akatsu, Y. Asano, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, A. Bay, I. Bedny, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, B. C.K. Casey, Y. Chao, B. G. Cheon, R. Chistov, Y. Choi, A. Chuvikov, M. Danilov, M. Dash, L. Y. Dong, S. Eidelman, V. Eiges, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, J. Haba, C. Hagner, F. Handa, N. C. Hastings, H. Hayashii, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, H. C. Huang, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, M. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, T. Kawasaki, H. Kichimi, D. W. Kim, H. J. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, P. Koppenburg, S. Korpar, P. Križan, P. Krokovny, Y. J. Kwon, S. H. Lee, T. Lesiak, J. Li, J. MacNaughton, D. Marlow, T. Matsumoto, A. Matyja, W. Mitaroff, H. Miyata, D. Mohapatra, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, N. Parslow, M. Peters, L. E. Piilonen, N. Root, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, A. Satpathy, O. Schneider, J. Schümann, A. J. Schwartz, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, M. Starič, A. Sugi, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, F. Takasaki, N. Tamura, M. Tanaka, Y. Teramoto, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, S. Uno, G. Varner, K. E. Varvell, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, Y. Yamada, Y. Yamashita, M. Yamauchi, Y. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   92 ( 5 )   5   2004年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The radiative decay [Formula presented] is observed for the first time. The branching fraction for the charged [Formula presented] decay mode is measured to be [Formula presented]. The photon energy distribution for the [Formula presented] decay is presented. The signal for the neutral [Formula presented] decay mode is not statistically significant and an upper limit, [Formula presented] at 90% C.L., is set. The analysis is based on a data set of [Formula presented] collected by the Belle experiment at the [Formula presented] asymmetric collider KEKB. © 2004 The American Physical Society.

    DOI: 10.1103/PhysRevLett.92.051801

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  • Freonless gas mixtures for glass RPC operated in streamer mode 査読

    Y Hoshi, Y Mikami, T Nagamine, K Watanabe, A Yamaguchi, Y Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   508 ( 1-2 )   56 - 62   2003年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have operated successfully glass Resistive Plate Counters (RPC) at the BELLE experiment by using a nonflammable gas mixture of 30% argon, 8% butane-silver and 62% freon, HFC-134a. This freon is nonozone depleting freon, but a freon has a high global warming potential in general. Thus a gas mixture for RPC might be desired to be freonless in the near future. We have tested the performance of glass RPC operated in streamer mode with a nonfreon gas mixture of argon, butane, CO2 and/or O-2 gases, and found an efficiency of about 90%. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0168-9002(03)01277-4

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  • Search for neutrinoless tau decays tau -&gt; 3l and tau -&gt; lK(S)(0) 査読

    Y Yusa, H Hayashii, T Nagamine, A Yamaguchi

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   123   95 - 101   2003年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Neutrinoless tau-lepton decays into either three leptons (tau- --&gt; l(1)(-)l(2)l(3)) or one lepton and one K-S(0) meson(tau- --&gt; l(-)K(S)(0)) where lepton means either an electron or muon, have been searched for using 48.6 fb(-1) of data collected with the Belle detector at the KEKB e(+)e(-) collider. No evidence for candidate decays are found in any channel. Therefore we set 90% confidence level upper limits on the branching fraction for 8 different decay modes. These limits are more stringent than those set previously and reach to the 10(-7) level.

    DOI: 10.1016/S0920-5632(03)02167-4

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  • Observation of [formula presented] decays

    J. Zhang, M. Nakao, K. Abe, K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, S. Bahinipati, A. M. Bakich, Y. Ban, E. Banas, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, R. Guo, F. Handa, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. C. Huang, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, M. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, S. U. Kataoka, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, D. W. Kim, H. J. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, P. Koppenburg, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, G. Leder, S. H. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, H. Matsumoto, T. Matsumoto, A. Matyja, W. Mitaroff, K. Miyabayashi, H. Miyata, D. Mohapatra, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, H. Park, K. S. Park, N. Parslow, J. P. Perroud, L. E. Piilonen, M. Rozanska, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, A. Satpathy, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, T. Shibata, H. Shibuya, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, S. Uno, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, Heyoung Yang, Y. Yusa, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar, D. Zürcher

    Physical Review Letters   91 ( 22 )   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the first observation of the charmless vector-vector decay process [Formula presented]. The measurement uses a [Formula presented] data sample collected with the Belle detector at the KEKB asymmetric [Formula presented] collider operating at the [Formula presented] resonance. We obtain a branching fraction of [Formula presented]. An analysis of the [Formula presented] helicity-angle distributions gives a longitudinal polarization fraction of [Formula presented]. We also measure the direct-[Formula presented]-violating asymmetry [Formula presented]. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.91.221801

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  • Measurement of branching fractions and polarization in [formula presented] decays

    K. F. Chen, A. Bozek, K. Abe, K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, A. M. Bakich, Y. Ban, E. Banas, A. Bay, P. K. Behera, I. Bizjak, A. Bondar, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, M. C. Chang, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, M. Dash, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, R. Guo, J. Haba, C. Hagner, F. Handa, H. Hayashii, M. Hazumi, T. Higuchi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. C. Huang, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, M. Jones, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, H. Kawai, T. Kawasaki, H. Kichimi, D. W. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, P. Koppenburg, S. Korpar, P. Krokovny, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, J. MacNaughton, F. Mandl, D. Marlow, H. Matsumoto, T. Matsumoto, A. Matyja, W. Mitaroff, H. Miyake, H. Miyata, D. Mohapatra, T. Mori, T. Nagamine, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, H. Palka, C. W. Park, H. Park, K. S. Park, N. Parslow, L. S. Peak, M. Peters, L. E. Piilonen, N. Root, M. Rozanska, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, M. Satapathy, A. Satpathy, O. Schneider, J. Schümann, A. J. Schwartz, S. Semenov, K. Senyo, M. E. Sevior, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, K. Sumisawa, T. Sumiyoshi, S. Suzuki, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, Y. Teramoto, T. Tomura, T. Tsuboyama, T. Tsukamoto, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, M. Watanabe, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, P. Yeh, M. Yokoyama, Y. Yusa, C. C. Zhang, J. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   91 ( 20 )   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present the first measurement of decay amplitudes in [Formula presented] and measurements of branching fractions in [Formula presented] decays based on [Formula presented] of data recorded at the [Formula presented] resonance with the Belle detector at the KEKB [Formula presented] storage ring. The decay amplitudes for the different [Formula presented] helicity states are measured from the angular distributions of final state particles in the transversity basis. The longitudinal and transverse complex amplitudes are [Formula presented], [Formula presented], [Formula presented], and [Formula presented]. The direct [Formula presented]-violating asymmetries are found to be consistent with zero. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.91.201801

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  • Observation of [Formula presented] and [Formula presented] Decays

    P. Krokovny, K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, A. Bay, I. Bedny, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, J. Haba, T. Hara, K. Hasuko, H. Hayashii, M. Hazumi, I. Higuchi, T. Higuchi, T. Hojo, Y. Hoshi, W. S. Hou, H. C. Huang, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, H. Kawai, Y. Kawakami, T. Kawasaki, H. Kichimi, D. W. Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, J. H. Kim, S. Kobayashi, P. Koppenburg, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, S. W. Lin, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, M. Peters, L. E. Piilonen, M. Rozanska, K. Rybicki, H. Sagawa, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, J. Schümann, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, T. Tsuboyama, T. Tsukamoto, S. Uehara, Y. Unno, S. Uno, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, Y. Yusa, C. C. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   90 ( 14 )   6   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on a search for [Formula presented] decays based on [Formula presented] [Formula presented] events collected with the Belle detector at KEKB. The [Formula presented] and [Formula presented] decays have been observed for the first time with the branching fractions [Formula presented] and [Formula presented]. No significant signal has been found for the [Formula presented] and [Formula presented] decay modes, and upper limits at 90% C.L. are presented. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.90.141802

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  • Observation of [formula presented]

    A. Ishikawa, K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, K. Akai, M. Akatsu, M. Akemoto, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, A. Bay, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, A. Chuvikov, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, J. Flanagan, C. Fukunaga, Y. Funakoshi, K. Furukawa, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, R. Guo, J. Haba, C. Hagner, F. Handa, H. Hayashii, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. C. Huang, T. Iijima, K. Inami, R. Itoh, H. Iwasaki, M. Iwasaki, Y. Iwasaki, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, E. Kikutani, H. J. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, P. Koppenburg, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, M. Masuzawa, T. Matsumoto, A. Matyja, S. Michizono, T. Mimashi, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, D. Mohapatra, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, T. T. Nakamura, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, Y. Ogawa, K. Ohmi, Y. Ohnishi, T. Ohshima, N. Ohuchi, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, H. Palka, C. W. Park, H. Park, N. Parslow, L. S. Peak, L. E. Piilonen, N. Root, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, M. Satapathy, A. Satpathy, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, T. Shidara, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, S. K. Swain, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, M. Tawada, G. N. Taylor, Y. Teramoto, T. Tomura, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, S. Uno, G. Varner, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, Heyoung Yang, J. Ying, M. Yoshida, Y. Yusa, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   91 ( 26 )   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the observation of the flavor-changing neutral current decay [Formula presented] and an improved measurement of the decay [Formula presented], where [Formula presented] represents an electron or a muon, with a data sample of [Formula presented] accumulated at the [Formula presented] resonance with the Belle detector at KEKB. The results for the branching fractions are [Formula Presented] and [Formula Presented], where the first error is statistical, the second is systematic and the third is from model dependence. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.91.261601

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  • Measurement of the Electroweak Penguin Process [Formula presented]

    J. Kaneko, K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, W. Bartel, A. Bay, P. K. Behera, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, R. Guo, J. Haba, F. Handa, T. Hara, Y. Harada, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, L. Hinz, T. Hojo, Y. Hoshi, W. S. Hou, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, A. Limosani, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, J. P. Perroud, M. Peters, L. E. Piilonen, N. Root, K. Rybicki, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, K. Trabelsi, W. Trischuk, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, M. Yokoyama, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   90 ( 2 )   6   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the first measurement of the branching fraction for the inclusive decay [Formula presented], where [Formula presented] is either an electron or a muon, and [Formula presented] is a hadronic recoil system that contains an [Formula presented] quark. We analyzed a data sample of [Formula presented] [Formula presented] meson pairs collected with the Belle detector at the KEKB [Formula presented] asymmetric-energy collider. We find [Formula presented] for dilepton masses greater than [Formula presented]. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.90.021801

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  • Studies of the Decay [Formula presented]

    K. Abe, K. Abe, N. Abe, R. Abe, T. Abe, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, B. C.K. Casey, M. C. Chang, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, F. Fang, H. Fujii, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, R. Guo, J. Haba, T. Hara, Y. Harada, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, L. Hinz, T. Hokuue, Y. Hoshi, S. R. Hou, W. S. Hou, S. C. Hsu, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, N. Katayama, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, A. Limosani, D. Liventsev, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, J. L. Rodriguez, F. J. Ronga, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, P. Yeh, Y. Yuan, Y. Yusa, J. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   90 ( 13 )   5   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report studies of the Cabibbo-suppressed decay [Formula presented], where [Formula presented] denotes [Formula presented] eigenstates of the [Formula presented] system. The analysis is based on a [Formula presented] sample collected at the [Formula presented] resonance with the Belle detector at the KEKB asymmetric [Formula presented] storage ring. We measure ratios of branching fractions, relative to Cabibbo-favored [Formula presented], of [Formula presented] and [Formula presented]
    the index 1 (2) denotes the [Formula presented] [Formula presented] eigenstate. We also extract the partial rate asymmetries for [Formula presented], finding [Formula presented] and [Formula presented]. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.90.131803

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  • Measurement of time-dependent [formula presented]-violating asymmetries in [formula presented], [formula presented], and [formula presented] decays

    K. Abe, K. Abe, T. Abe, I. Adachi, H. Aihara, K. Akai, M. Akatsu, Y. Asano, T. Aso, T. Aushev, S. Bahinipati, A. M. Bakich, Y. Ban, S. Banerjee, I. Bedny, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, M. C. Chang, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, A. Chuvikov, M. Danilov, L. Y. Dong, S. Eidelman, V. Eiges, Y. Enari, J. Flanagan, C. Fukunaga, K. Furukawa, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, R. Guo, J. Haba, C. Hagner, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, I. Higuchi, T. Higuchi, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, M. Iwasaki, Y. Iwasaki, T. Kamitani, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, H. Kawai, T. Kawasaki, H. Kichimi, M. Kikuchi, E. Kikutani, H. J. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, H. Koiso, P. Koppenburg, S. Korpar, P. Križan, P. Krokovny, S. Kumar, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, F. Mandl, D. Marlow, M. Masuzawa, T. Matsumoto, A. Matyja, S. Michizono, T. Mimashi, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, D. Mohapatra, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, T. T. Nakamura, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, Y. Ogawa, K. Ohmi, Y. Ohnishi, T. Ohshima, N. Ohuchi, K. Oide, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, M. Peters, L. E. Piilonen, N. Root, M. Rozanska, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, S. Semenov, K. Senyo, M. E. Sevior, T. Shibata, H. Shibuya, T. Shidara, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, R. Sugahara, A. Sugi, T. Sugimura, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, F. Takasaki, N. Tamura, J. Tanaka, M. Tanaka, M. Tawada, Y. Teramoto, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, H. Yamamoto, N. Yamamoto, Y. Yamashita, M. Yamauchi, H. Yanai, Heyoung Yang, J. Ying, M. Yokoyama, M. Yoshida, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar, D. Zürcher

    Physical Review Letters   91 ( 26 )   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present an improved measurement of [Formula presented]-violation parameters in [Formula presented], [Formula presented], and [Formula presented] decays based on a [Formula presented] data sample collected at the [Formula presented] resonance with the Belle detector at the KEKB energy-asymmetric [Formula presented] collider. One neutral [Formula presented] meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying [Formula presented] meson is identified from its decay products. [Formula presented]-violation parameters for each of the three modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two [Formula presented] decays. We find that the observed [Formula presented] asymmetry in the [Formula presented] decay differs from the standard model (SM) expectation by 3.5 standard deviations, while the other cases are consistent with the SM. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.91.261602

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  • Studies of [Formula Presented] mixing properties with inclusive dilepton events

    N. C. Hastings, K. Abe, K. Abe, R. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, A. Bay, I. Bedny, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, M. Chang, P. Chang, Y. Chao, K. Chen, B. G. Cheon, R. Chistov, S. Choi, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, J. Haba, C. Hagner, F. Handa, T. Hara, K. Hasuko, H. Hayashii, M. Hazumi, I. Higuchi, L. Hinz, T. Hokuue, Y. Hoshi, W. Hou, Y. B. Hsiung, H. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, D. W. Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, S. Lin, D. Liventsev, R. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, J. Perroud, L. E. Piilonen, F. J. Ronga, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, J. Schümann, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, Y. Yamashita, M. Yamauchi, H. Yanai, M. Yokoyama, Y. Yuan, Y. Yusa, C. C. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review D - Particles, Fields, Gravitation and Cosmology   67 ( 5 )   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report a precise determination of the [Formula Presented] mixing parameter [Formula Presented] based on the time evolution of same-sign and opposite-sign dilepton yields in [Formula Presented] decays. Data were collected with the Belle detector at KEKB. Using data samples of 29.4 [Formula Presented] recorded at the [Formula Presented] resonance and 3.0 [Formula Presented] recorded at an energy 60 MeV below the resonance, we measure [Formula Presented] From the same analysis, we also measure the ratio of charged and neutral B meson production at the [Formula Presented] [Formula Presented] and CPT violation parameters in [Formula Presented] mixing, [Formula Presented] and [Formula Presented]. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevD.67.052004

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  • Observation of the Decay [Formula presented]

    N. Gabyshev, H. Kichimi, K. Abe, K. Abe, R. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, A. Bay, I. Bedny, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, M. C. Chang, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, F. Fang, C. Fukunaga, A. Garmash, T. Gershon, B. Golob, J. Haba, C. Hagner, F. Handa, T. Hara, K. Hasuko, H. Hayashii, M. Hazumi, I. Higuchi, L. Hinz, T. Hojo, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, H. Kawai, T. Kawasaki, D. W. Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, S. W. Lin, D. Liventsev, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, Y. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, J. P. Perroud, L. E. Piilonen, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, J. Schümann, A. J. Schwartz, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, T. Tsuboyama, T. Tsukamoto, S. Uehara, Y. Unno, S. Uno, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, Y. Yamashita, M. Yamauchi, H. Yanai, Y. Yuan, Y. Yusa, C. C. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   90 ( 12 )   5   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the measurement of the charmed baryonic decay [Formula presented] with a branching fraction of [Formula presented] and a statistical significance of [Formula presented]. The errors are statistical, systematic, and the error of the [Formula presented] decay branching fraction. This is the first observation of a two-body baryonic [Formula presented] decay. The analysis is based on [Formula presented] of data accumulated at the [Formula presented] resonance with the Belle detector at the KEKB asymmetric [Formula presented] collider. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.90.121802

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  • Measurement of Branching Fractions for [Formula presented] Decays

    F. Fang, T. Hojo, K. Abe, K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, A. M. Bakich, Y. Ban, E. Banas, A. Bay, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, T. Higuchi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, D. Liventsev, R. S. Lu, J. MacNaughton, F. Mandl, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, C. W. Park, H. Park, K. S. Park, J. P. Perroud, M. Peters, L. E. Piilonen, F. J. Ronga, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, N. Soni, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, T. Takahashi, F. Takasaki, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, S. Uno, Y. Ushiroda, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, M. Yokoyama, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   90 ( 7 )   6   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report measurements of branching fractions for charged and neutral [Formula presented] decays where the [Formula presented] meson is reconstructed in the [Formula presented], [Formula presented], [Formula presented], and [Formula presented] decay channels. The neutral [Formula presented] channel is a [Formula presented] eigenstate and can be used to measure the [Formula presented] violation parameter [Formula presented]. We also report the first observation of the [Formula presented] mode. The results are based on an analysis of [Formula presented] of data collected by the Belle detector at KEKB. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.90.071801

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  • Muon identification in the Belle experiment at KEKB 査読

    A Abashian, K Abe, K Abe, PK Behara, F Handa, T Iijima, Y Inoue, H Miyake, T Nagamine, E Nakano, S Narita, L Piilonen, S Schrenk, Y Teramoto, K Trabelsi, JG Wang, M Yamaga, A Yamaguchi, Y Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   491 ( 1-2 )   69 - 82   2002年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    This paper describes the muon identification method and its performance in the Belle experiment at KEKB. Muon and hadron likelihood are calculated for each track using its range and transverse scattering in the K-L-and-muon detector (KLM). We apply a cut on the normalized muon likelihood L-mu to identify the track as a muon. Above the detection threshold of 0.6 GeV/c, the measured muon detection efficiency and pion fake rate are approximately constant for momenta greater than 1.0 and 1.5 GeV/c, respectively. Between 1.0 and 3.0 GeV/c, the averaged muon detection efficiency is 89% and the pion fake rate per track is 1.4% over the KLM acceptance, using the standard selection criterion L-mu &gt; 0.9. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0168-9002(02)01164-6

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  • Measurement of the [Formula presented] Mixing Parameter [Formula presented] using Semileptonic [Formula presented] Decays

    K. Hara, M. Hazumi, K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, A. Bay, I. Bedny, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, J. Dragic, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, R. Guo, J. Haba, K. Hanagaki, F. Handa, T. Hara, N. C. Hastings, H. Hayashii, E. M. Heenan, I. Higuchi, T. Higuchi, L. Hinz, Y. Hoshi, W. S. Hou, Y. B. Hsiung, S. C. Hsu, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, H. Kakuno, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, T. H. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, T. Matsuishi, S. Matsumoto, T. Matsumoto, K. Miyabayashi, Y. Miyabayashi, H. Miyata, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, H. Palka, C. W. Park, H. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, J. B. Singh, N. Soni, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, T. Takahashi, F. Takasaki, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, M. Yokoyama, Y. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   89 ( 25 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present a measurement of the [Formula presented] mixing parameter [Formula presented] using neutral [Formula presented] meson pairs in a [Formula presented] data sample collected at the [Formula presented] resonance with the Belle detector at the KEKB asymmetric-energy [Formula presented] collider. We exclusively reconstruct one neutral [Formula presented] meson in the semileptonic [Formula presented] decay mode and identify the flavor of the accompanying [Formula presented] meson from its decay products. From the distribution of the time intervals between the two flavor-tagged [Formula presented] meson decay points, we obtain [Formula presented], where the first error is statistical and the second error is systematic. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.89.251803

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  • Observation of the Decay [Formula presented]

    K. Abe, R. Abe, T. Abe, H. Aihara, M. Akatsu, Y. Asano, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, A. Bay, I. Bedny, P. K. Behera, A. Bondar, A. Bozek, J. Brodzicka, T. E. Browder, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, H. Fujii, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, R. Guo, F. Handa, T. Hara, H. Hayashii, M. Hazumi, E. M. Heenan, T. Higuchi, L. Hinz, T. Hojo, T. Hokuue, Y. Hoshi, S. R. Hou, W. S. Hou, H. C. Huang, T. Igaki, T. Iijima, A. Ishikawa, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Korpar, P. Krokovny, R. Kulasiri, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, J. Li, D. Liventsev, J. MacNaughton, G. Majumder, S. Matsumoto, T. Matsumoto, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, C. W. Park, H. Park, L. S. Peak, J. P. Perroud, L. E. Piilonen, F. J. Ronga, N. Root, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, S. K. Swain, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, M. Yokoyama, Y. Yuan, Y. Yusa, J. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   89 ( 12 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the first observation of the decay [Formula presented] with the Belle detector at the KEKB [Formula presented] Collider operated at the [Formula presented] resonance. The sum of branching fractions [Formula presented] is measured to be [Formula presented] using the full reconstruction method where both charmed mesons from [Formula presented] decays are reconstructed. A consistent value [[Formula presented]] is obtained using a partial reconstruction technique that uses only the slow pion from the [Formula presented] decay and a fully reconstructed [Formula presented] to reconstruct the [Formula presented]. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.89.122001

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  • Measurement of the Lifetime Difference in [Formula presented] Meson Decays

    K. Abe, K. Abe, R. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, S. Behari, P. K. Behera, A. Bondar, A. Bozek, T. E. Browder, B. C.K. Casey, Y. Chao, B. G. Cheon, R. Chistov, Y. Choi, L. Y. Dong, S. Eidelman, V. Eiges, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W. S. Hou, S. C. Hsu, H. C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, P. Jalocha, H. K. Jang, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, T. H. Kim, K. Kinoshita, S. Kobayashi, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, D. Liventsev, J. MacNaughton, D. Marlow, T. Matsubara, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, K. S. Park, J. P. Perroud, M. Peters, L. E. Piilonen, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, J. B. Singh, S. Stanič, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, M. Yokoyama, K. Yoshida, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   88 ( 16 )   6   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report a measurement of the [Formula presented] mixing parameter [Formula presented] using [Formula presented] of data collected near the [Formula presented] resonance with the Belle detector at KEKB. [Formula presented] is measured from the lifetime difference of [Formula presented] mesons decaying into the [Formula presented] state and the [Formula presented]-even eigenstate [Formula presented]. We find [Formula presented], where the first error is statistical and the second is systematic, corresponding to a [Formula presented] confidence interval [Formula presented]. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.88.162001

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  • Radiative [Formula presented] Meson Decays into [Formula presented] and [Formula presented] Final States

    S. Nishida, M. Nakao, K. Abe, K. Abe, T. Abe, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, W. Bartel, A. Bay, I. Bedny, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, T. Gershon, A. Gordon, K. Gotow, R. Guo, J. Haba, T. Hara, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, S. R. Hou, W. S. Hou, S. C. Hsu, H. C. Huang, T. Igaki, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, P. Jalocha, H. K. Jang, J. H. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, T. H. Kim, K. Kinoshita, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, S. Matsumoto, T. Matsumoto, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, J. W. Nam, Z. Natkaniec, K. Neichi, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, Y. Yuan, Y. Yusa, J. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar

    Physical Review Letters   89 ( 23 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report observations of radiative [Formula presented] meson decays into the [Formula presented] and [Formula presented] final states. In the [Formula presented] channel, we present evidence for decays via an intermediate tensor meson state with a branching fraction of [Formula presented]. We measure the branching fraction [Formula presented], in which the [Formula presented] and [Formula presented] channels dominate. The analysis is based on a data set of [Formula presented] recorded by the Belle experiment at the KEKB collider. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.89.231801

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  • Study of [Formula presented]-Violating Asymmetries in [Formula presented] Decays

    K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, I. Bedny, S. Behari, P. K. Behera, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, M. Danilov, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W. S. Hou, S. C. Hsu, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Koishi, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, A. Limosani, D. Liventsev, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsuishi, S. Matsumoto, T. Matsumoto, Y. Mikami, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, E. Prebys, J. L. Rodriguez, F. J. Ronga, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, W. Trischuk, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, J. Yashima, P. Yeh, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   89 ( 7 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present a measurement of [Formula presented]-violating asymmetries in [Formula presented] decays based on a [Formula presented] data sample collected at the [Formula presented] resonance with the Belle detector at the KEKB asymmetric-energy [Formula presented] collider. We fully reconstruct one neutral [Formula presented] meson as a [Formula presented] [Formula presented] eigenstate and identify the flavor of the accompanying [Formula presented] meson from its decay products. From the asymmetry in the distribution of the time intervals between the two [Formula presented] meson decay points, we obtain the [Formula presented]-violating asymmetry parameters [Formula presented] and [Formula presented]. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.89.071801

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  • Observation of [Formula presented] and Evidence for [Formula presented] Final States in Neutral [Formula presented] Decays

    P. Krokovny, K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, A. Bay, I. Bedny, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, R. Guo, J. Haba, K. Hanagaki, F. Handa, Y. Harada, H. Hayashii, M. Hazumi, E. M. Heenan, T. Higuchi, L. Hinz, T. Hojo, T. Hokuue, Y. Hoshi, W. S. Hou, H. C. Huang, T. Igaki, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, H. K. Jang, J. Kaneko, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Korpar, P. Križan, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, A. Limosani, D. Liventsev, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, C. W. Park, H. Park, J. P. Perroud, M. Peters, L. E. Piilonen, F. J. Ronga, N. Root, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, C. Schwanda, S. Semenov, K. Senyo, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   89 ( 23 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the first observation of a [Formula presented] meson decay that is not accessible by a direct spectator process. The channel [Formula presented] is found in a sample of [Formula presented] [Formula presented] events, collected with the Belle detector at KEKB, with a branching fraction [Formula presented]. We also obtain evidence for the [Formula presented] decay with branching fraction [Formula presented]. This value may be used to extract a model-dependent value of [Formula presented]. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.89.231804

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  • Search for charmless two-body baryonic decays of [Formula Presented] mesons

    K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, P. Chang, Y. Chao, B. G. Cheon, K. Chen, R. Chistov, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, R. Guo, J. Haba, H. Hamasaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, S. R. Hou, W. Hou, S. Hsu, H. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, P. Jalocha, H. K. Jang, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, H. Kawai, Y. Kawakami, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. Kwon, J. S. Lange, G. Leder, S. H. Lee, D. Liventsev, R. Lu, J. MacNaughton, G. Majumder, F. Mandl, T. Matsuishi, S. Matsumoto, Y. Mikami, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, J. Perroud, M. Peters, L. E. Piilonen, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, P. Yeh, K. Yoshida, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review D - Particles, Fields, Gravitation and Cosmology   65 ( 9 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the results of a search for the rare baryonic decays [Formula Presented] [Formula Presented] and [Formula Presented] The analysis is based on a data set of [Formula Presented] events collected by the Belle detector at the KEKB [Formula Presented] collider. No statistically significant signals are found, and we set branching fraction upper limits [Formula Presented] [Formula Presented] and [Formula Presented] at the 90% confidence level. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevD.65.091103

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  • Precise Measurement of [Formula presented] Meson Lifetimes with Hadronic Decay Final States

    K. Abe, K. Abe, R. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, H. Guler, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hokuue, Y. Hoshi, S. R. Hou, W. S. Hou, S. C. Hsu, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, A. Limosani, D. Liventsev, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsubara, T. Matsuishi, S. Matsumoto, T. Matsumoto, Y. Mikami, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, K. S. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, J. L. Rodriguez, F. Ronga, M. Rozanska, K. Rybicki, H. Sagawa, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   88 ( 17 )   6   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The lifetimes of the [Formula presented] and [Formula presented] mesons are extracted from [Formula presented] of data collected with the Belle detector at the KEK [Formula presented] factory. A fit to the decay length differences of neutral and charged [Formula presented] meson pairs, measured in events where one of the [Formula presented] mesons is fully reconstructed in several hadronic modes, yields [Formula presented], [Formula presented], and [Formula presented]. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.88.171801

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  • Observation of [Formula presented] Production in [Formula presented] Meson Decay

    K. Abe, K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W. S. Hou, H. C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, D. J. Jackson, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, A. Limosani, D. Liventsev, R. S. Lu, J. MacNaughton, F. Mandl, D. Marlow, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, K. S. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, F. Ronga, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, M. Yokoyama, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, D. Žontar

    Physical Review Letters   89 ( 1 )   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the first observation of [Formula presented] production in [Formula presented] meson decays. We find an inclusive [Formula presented] branching fraction of [Formula presented]. The data set, collected with the Belle detector at the KEKB [Formula presented] collider, consists of [Formula presented] [Formula presented] events. We also present branching fractions and momentum spectra for both [Formula presented] and [Formula presented] production. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.89.011803

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  • A search for a freonless gas mixture for glass RPC 査読

    S Narita, K Watanabe, K Abe, F Handa, Higuchi, I, Y Hoshi, N Kawamura, K Kumagai, Y Mikami, N Murono, T Nagamine, K Neichi, N Takahashi, M Yamaga, A Yamaguchi, Y Yusa, H Yuta

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   48 ( 3 )   893 - 899   2001年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have operated successfully glass resistive plate counters in the streamer mode at the BELLE experiment by using a nonflammable gas mixture of argon 30 %, butane-silver 8 %, and freon, HFC-134a 62 %. This freon is non-ozone-depleting but has a high global warming potential (1300 times higher than that of CO2). Thus freon gases might be unusable in the near future. We tested the performance of a glass resistive plate counter operated in the streamer mode with an alternative gas mixtures of argon, butane, CO2, and/or O-2 gases and found an efficiency of about 90 %.

    DOI: 10.1109/23.940129

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  • Performance of glass RPC operated in streamer mode with SF6 gas mixture 査読

    K Abe, F Handa, Higuchi, I, Y Hoshi, N Kawamura, Y Mikami, T Nagamine, S Narita, K Neichi, M Ueki, M Yamaga, A Yamaguchi, Y Yusa, H Yuta

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   455 ( 2 )   397 - 404   2000年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have tested the performance of glass RPC operated in streamer mode with the gas mixture containing SF, instead of freon, HFC-134a. By using a small amount of SF,, we could operate the RPCs at a much lower high voltage with comparable performance to the HFC-134a mixture except for having a narrower efficiency plateau. The feasibility for using the SF6 mixture is discussed. (C) 2000 Elsevier Science B.V. All rights reserved.

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  • Measurement of the $B^0$ lifetime using fully reconstructed hadronic decays in the 2019 Belle II dataset

    Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak, K. Adamczyk, P. Ahlburg, J. K. Ahn, H. Aihara, N. Akopov, A. Aloisio, F. Ameli, L. Andricek, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, V. Aushev, T. Aziz, V. Babu, S. Bacher, S. Baehr, S. Bahinipati, A. M. Bakich, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, W. Bartel, G. Batignani, J. Baudot, A. Beaulieu, J. Becker, P. K. Behera, M. Bender, J. V. Bennett, E. Bernieri, F. U. Bernlochner, M. Bertemes, M. Bessner, S. Bettarini, V. Bhardwaj, B. Bhuyan, F. Bianchi, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, P. Branchini, N. Braun, R. A. Briere, T. E. Browder, D. N. Brown, A. Budano, L. Burmistrov, S. Bussino, M. Campajola, L. Cao, G. Caria, G. Casarosa, C. Cecchi, D. Červenkov, M. -C. Chang, P. Chang, R. Cheaib, V. Chekelian, Y. Q. Chen, Y. -T. Chen, B. G. Cheon, K. Chilikin, H. -E. Cho, K. Cho, S. -J. Cho, S. -K. Choi, S. Choudhury, D. Cinabro, L. Corona, L. M. Cremaldi, D. Cuesta, S. Cunliffe, T. Czank, N. Dash, F. Dattola, E. De La Cruz-Burelo, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, B. Deschamps, M. Destefanis, S. Dey, A. De Yta-Hernandez, F. Di Capua, S. Di Carlo, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, K. Dort, D. Dossett, S. Dubey, S. Duell, G. Dujany, S. Eidelman, M. Eliachevitch, D. Epifanov, J. E. Fast, T. Ferber, D. Ferlewicz, G. Finocchiaro, S. Fiore, P. Fischer, A. Fodor, F. Forti, A. Frey, M. Friedl, B. G. Fulsom, M. Gabriel, N. Gabyshev, E. Ganiev, M. Garcia-Hernandez, R. Garg, A. Garmash, V. Gaur, A. Gaz, U. Gebauer, M. Gelb, A. Gellrich, J. Gemmler, T. Geßler, D. Getzkow, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, P. Goldenzweig, B. Golob, P. Gomis, P. Grace, W. Gradl, E. Graziani, D. Greenwald, Y. Guan, C. Hadjivasiliou, S. Halder, K. Hara, T. Hara, O. Hartbrich, T. Hauth, K. Hayasaka, H. Hayashii, C. Hearty, M. Heck, M. T. Hedges, I. Heredia de la Cruz, M. Hernández Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, H. Hirata, S. Hirose, M. Hoek, M. Hohmann, S. Hollitt, T. Hotta, C. -L. Hsu, Y. Hu, K. Huang, T. Iijima, K. Inami, G. Inguglia, J. Irakkathil Jabbar, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, S. Iwata, P. Jackson, W. W. Jacobs, I. Jaegle, D. E. Jaffe, E. -J. Jang, M. Jeandron, H. B. Jeon, S. Jia, Y. Jin, C. Joo, K. K. Joo, I. Kadenko, J. Kahn, H. Kakuno, A. B. Kaliyar, J. Kandra, K. H. Kang, P. Kapusta, G. Karyan, Y. Kato, H. Kawai, T. Kawasaki, T. Keck, C. Ketter, H. Kichimi, C. Kiesling, B. H. Kim, C. -H. Kim, D. Y. Kim, H. J. Kim, J. B. Kim, K. -H. Kim, K. Kim, S. -H. Kim, Y. -K. Kim, Y. Kim, T. D. Kimmel, H. Kindo, K. Kinoshita, B. Kirby, C. Kleinwort, B. Knysh, P. Kodyš, T. Koga, S. Kohani, S. Koirala, I. Komarov, T. Konno, S. Korpar, E. Kou, N. Kovalchuk, T. M. G. Kraetzschmar, P. Križan, R. Kroeger, J. F. Krohn, P. Krokovny, H. Krüger, W. Kuehn, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kumita, T. Kunigo, M. Künzel, S. Kurz, A. Kuzmin, P. Kvasnička, Y. -J. Kwon, S. Lacaprara, Y. -T. Lai, C. La Licata, K. Lalwani, L. Lanceri, J. S. Lange, K. Lautenbach, P. J. Laycock, F. R. Le Diberder, I. -S. Lee, S. C. Lee, P. Leitl, D. Levit, P. M. Lewis, C. Li, L. K. Li, S. X. Li, Y. M. Li, Y. B. Li, J. Libby, K. Lieret, L. Li Gioi, J. Lin, Z. Liptak, Q. Y. Liu, Z. A. Liu, D. Liventsev, S. Longo, A. Loos, P. Lu, M. Lubej, T. Lueck, F. Luetticke, T. Luo, C. MacQueen, Y. Maeda, M. Maggiora, S. Maity, R. Manfredi, E. Manoni, S. Marcello, C. Marinas, A. Martini, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, J. McNeil, F. Meggendorfer, J. C. Mei, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, K. Azmi, G. B. Mohanty, H. Moon, T. Moon, J. A. Mora Grimaldo, A. Morda, T. Morii, H. -G. Moser, M. Mrvar, F. Mueller, F. J. Müller, Th. Muller, G. Muroyama, R. Mussa, K. Nakagiri, I. Nakamura, K. R. Nakamura, E. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, T. Nanut, Z. Natkaniec, M. Nayak, G. Nazaryan, D. Neverov, C. Niebuhr, M. Niiyama, J. Ninkovic, N. K. Nisar, S. Nishida, K. Nishimura, M. Nishimura, M. H. A. Nouxman, B. Oberhof, K. Ogawa, S. Ogawa, S. L. Olsen, Y. Onishchuk, H. Ono, Y. Onuki, P. Oskin, E. R. Oxford, H. Ozaki, P. Pakhlov, G. Pakhlova, A. Paladino, T. Pang, A. Panta, E. Paoloni, C. Park, H. Park, S. -H. Park, B. Paschen, A. Passeri, A. Pathak, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, V. Popov, C. Praz, E. Prencipe, M. T. Prim, M. V. Purohit, P. Rados, R. Rasheed, M. Reif, S. Reiter, M. Remnev, P. K. Resmi, I. Ripp-Baudot, M. Ritter, M. Ritzert, G. Rizzo, L. B. Rizzuto, S. H. Robertson, D. Rodríguez Pérez, J. M. Roney, C. Rosenfeld, A. Rostomyan, N. Rout, M. Rozanska, S. Rummel, G. Russo, D. Sahoo, Y. Sakai, D. A. Sanders, S. Sandilya, A. Sangal, L. Santelj, P. Sartori, J. Sasaki, Y. Sato, V. Savinov, B. Scavino, M. Schram, H. Schreeck, J. Schueler, C. Schwanda, A. J. Schwartz, B. Schwenker, R. M. Seddon, Y. Seino, A. Selce, K. Senyo, I. S. Seong, M. E. Sevior, C. Sfienti, V. Shebalin, C. P. Shen, H. Shibuya, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, S. Skambraks, K. Smith, R. J. Sobie, A. Soffer, A. Sokolov, Y. Soloviev, E. Solovieva, S. Spataro, B. Spruck, M. Starič, S. Stefkova, Z. S. Stottler, R. Stroili, J. Strube, J. Stypula, M. Sumihama, K. Sumisawa, T. Sumiyoshi, D. J. Summers, W. Sutcliffe, K. Suzuki, S. Y. Suzuki, M. Tabata, M. Takahashi, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, H. Tanigawa, N. Taniguchi, Y. Tao, P. Taras, F. Tenchini, D. Tonelli, E. Torassa, K. Trabelsi, T. Tsuboyama, N. Tsuzuki, M. Uchida, I. Ueda, S. Uehara, T. Ueno, T. Uglov, K. Unger, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, S. E. Vahsen, R. van Tonder, G. S. Varner, K. E. Varvell, A. Vinokurova, L. Vitale, V. Vorobyev, A. Vossen, E. Waheed, H. M. Wakeling, K. Wan, W. Wan Abdullah, B. Wang, C. H. Wang, M. -Z. Wang, X. L. Wang, A. Warburton, M. Watanabe, S. Watanuki, I. Watson, J. Webb, S. Wehle, M. Welsch, C. Wessel, J. Wiechczynski, P. Wieduwilt, H. Windel, E. Won, L. J. Wu, X. P. Xu, B. Yabsley, S. Yamada, W. Yan, S. B. Yang, H. Ye, J. Yelton, I. Yeo, J. H. Yin, M. Yonenaga, Y. M. Yook, T. Yoshinobu, C. Z. Yuan, G. Yuan, W. Yuan, Y. Yusa, L. Zani, J. Z. Zhang, Y. Zhang, Z. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, V. Zhulanov, A. Zupanc

    Physical Review D   107 ( 9 )   2020年5月

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    This document presents the measurement of $B^0$ meson lifetimes using the
    2019 Belle II dataset that corresponds to an integrated luminosity of $8.7 \pm
    0.2$ fb$^{-1}$. Each candidate is fully reconstructed with hadronic decay final
    states on the signal side, while the rest-of-event technique allows to infer
    the decay vertex position on the other (tag) side. $B^0$ lifetime is extracted
    from an unbinned maximum likelihood fit to the distribution of the difference
    between the signal side $B^0$ candidate and the tag side decay times. The
    measured lifetime is $\tau_{B^0} = 1.48 \pm 0.28 \pm 0.06 $ ps, where the first
    uncertainty is statistical and the second is systematic.

    DOI: 10.1103/PhysRevD.107.L091102

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    その他リンク: http://arxiv.org/pdf/2005.07507v2

  • The aerogel Ring Imaging Cherenkov system at the Belle II spectrometer

    R. Pestotnik, I. Adachi, R. Dolenec, K. Hataya, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, T. Kobayashi, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, S. Ogawa, L. Santelj, T. Sumiyoshi, M. Tabata, M. Yonenaga, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   265 - 268   2017年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    In the forward end-cap of the Belle II spectrometer, a proximity focusing Ring Imaging Cherenkov counter with an aerogel radiator will be installed. The detector will occupy a limited space inside solenoid magnet with longitudinal field of 1.5 T. It will consist of a double layer aerogel radiator, an expansion volume and a photon detector. 420 Hamamatsu hybrid avalanche photo sensors with 144 channels each will be used to read out single Cherenkov photons with high efficiency. More than 60,000 analog signals will be digitized and processed in the front end electronics and send to the unified experiment data acquisition system.
    The detector components have been successfully produced and are now being installed in the spectrometer. Tested before on the bench, they are currently being installed in the mechanical frame. Part of the detector have been commissioned and connected to the acquisition system to register the cosmic ray particles. The first preliminary results are in accordance with previous expectations.
    We expect an excellent performance of the device which will allow at least a 4s separation of pions from kaons in the experiment kinematic region from 0.5 GeV/c to 4 GeV/c. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2017.04.043

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  • Behaviour of Belle II ARICH Hybrid Avalanche Photo-Detector in magnetic field

    H. Kindo, I. Adachi, R. Dolenec, K. Hataya, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, T. Kobayashi, T. Konno, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, S. Ogawa, R. Pestotnik, L. Santelj, T. Sumiyoshi, M. Tabata, M. Yonenaga, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   269 - 271   2017年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    The proximity-focusing Aerogel Ring-Imaging Cherenkov detector (ARICH) has been designed to separate kaons from pions in the forward end-cap of the Belle II spectrometer. The detector will be placed in 1.5 T magnetic field and must have immunity to it. In ARICH R&D, we solve the problem with new equipment called Hybrid Avalanche Photo-Detector (HAPD) which developed by Hamamatsu Photonics. Recently the production of about 500 HAPDs was completed. We test HAPDs in magnetic field in KEK. We found some HAPDs have significant amount of dead time, which reaches up to 30% in the worst case. The dead time is caused by very large (more than 10,000 times larger than a single photon signal) and frequent (similar to 5 Hz) signals, which make electronics paralysed. The huge signals are observed in about 30% of HAPDs. To identify the origin and understand the mechanism, we perform some extra test of HAPDs. We find a strange dependence of the huge signals to the APD bias voltage. If we reduce the bias voltage applied to one of the 4 APDs by 10 V, the frequency of the huge signals is much reduced. On the other hand, if we reduce the voltage of all the 4 HAPDs, huge signals do not decrease, or even increase in some case. We also find the huge signals seems to be related to the vacuum inside HAPD. We present about the observation of the huge signals of HAPDs in the magnetic field, and our strategy to manage it. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2017.04.044

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  • Development of the ARICH monitor system for the Belle II experiment

    K. Hataya, I. Adachi, R. Dolenec, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, T. Kobayashi, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, S. Ogawa, R. Pestotnik, L. Santelj, T. Sumiyoshi, M. Tabata, M. Yonenaga, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   176 - 180   2017年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    The Belle II detector is under construction at KEK in Japan. In the forward endcap region of the Belle II detector, particle identification (PID) is performed by the Aerogel Ring Imaging Cherenkov (ARICH) counter composed of aerogel tiles and 144-channel Hybrid Avalanche Photo-Detectors (HAPDs). The photon detection efficiency of the photosensor is important for a stable operation of the ARICH. To examine the performance of the HAPDs periodically, a monitor system using scattered photons injected by optical fibers is being developed. In this paper, we report the test using the prototype monitor system and the tests with a partially built ARICH detector.

    DOI: 10.1016/j.nima.2017.02.070

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  • Construction of silica aerogel radiator system for Belle II RICH Counter

    I. Adachi, R. Dolenec, K. Hataya, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, T. Kobayashi, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, S. Ogawa, R. Pestotnik, L. Santelj, T. Sumiyoshi, M. Tabata, M. Yonenaga, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   129 - 132   2017年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    We have developed a RICH counter as a new forward particle identification device for the Belle II experiment. As a Cherenkov radiator in this counter, a dual aerogel layer combination consisting of two refractive indicies, n=1.045 and 1.055, is employed. Mass production of these aerogel tiles has been done during 2013-2014 with new method improved by Chiba group. Optical qualities for them have been examined. The refractive indices of the obtained tiles were found to be in good agreement with our expectations, and the transparencies were high enough to be used for the RICH radiator.

    DOI: 10.1016/j.nima.2017.02.036

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  • Development of slow control system for the Belle II ARICH counter

    M. Yonenaga, I. Adachi, R. Dolenec, K. Hataya, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, T. Kobayashi, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, S. Ogawa, R. Pestotnik, L. Santelji, T. Sumiyoshi, M. Tabata, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   241 - 245   2017年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    A slow control system (SCS) for the Aerogel Ring Imaging Cherenkov (ARICH) counter in the Belle II experiment was newly developed and coded in the development frameworks of the Belle II DAQ software. The ARICH is based on 420 Hybrid Avalanche Photo-Detectors (HAPDs). Each HAPD has 144 pixels to be readout and requires 6 power supply (PS) channels, therefore a total number of 2520 PS channels and 60,480 pixels have to be configured and controlled. Graphical User Interfaces (GUIs) with detector oriented view and device oriented view, were also implemented to ease the detector operation. The ARICH SCS is in operation for detector construction and cosmic rays tests. The paper describes the detailed features of the SCS and preliminary results of operation of a reduced set of hardware which confirm the scalability to the full detector.

    DOI: 10.1016/j.nima.2017.03.037

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  • Recent developments in software for the Belle II aerogel RICH

    L. Santelj, I. Adachi, R. Dolenec, K. Hataya, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, T. Kobayashi, S. Korpar, P. Krizan, T. Kumita, M. Mrvar, S. Nishida, K. Ogawa, S. Ogawa, R. Pestotnik, T. Sumiyoshi, M. Tabata, M. Yonenaga, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   876   104 - 107   2017年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    For the Belle II spectrometer a proximity focusing RICH counter with an aerogel radiator (ARICH) will be employed as a PID system in the forward end-cap region of the spectrometer. The detector will provide about 4 sigma separation of pions and kaons up to momenta of 3.5 GeV/c, at the kinematic limits of the experiment. We present the up-to-date status of the ARICH simulation and reconstruction software, focusing on the recent improvements of the reconstruction algorithms and detector description in the Geant4 simulation. In addition, as a demonstration of detector readout software functionality we show the first cosmic ray Cherenkov rings observed in the ARICH.

    DOI: 10.1016/j.nima.2017.02.017

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  • Studies of a hybrid avalanche photo-detector in magnetic field

    L. Santelj, I. Adachi, K. Hataya, S. Iori, S. Iwata, H. Kakuno, R. Kataura, H. Kawai, H. Kindo, S. Korpar, P. Krizan, M. Mrvar, K. Nath, S. Nishida, S. Ogawa, R. Pestotnik, A. Stanovnik, A. Seljak, T. Sumiyoshi, M. Tabata, E. Tahirovic, Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   845   459 - 462   2017年2月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    For the Belle II spectrometer a proximity focusing RICH counter with an aerogel radiator (ARICH) will be employed as a PID system in the forward endcap region of the spectrometer. The main challenge was the development of a reliable multichannel sensor for single photons that Operates in the high magnetic field of the spectrometer (1.5 T) and withstands the radiation levels expected at the experiment. A 144 channel Hybrid Avalanche Photo-Detector (HAPD) was developed with Hamamatsu Photonics K.K. and the mass production of similar to 480 HAPDs was completed recently. While our first tests of HAPD performance in the magnetic field (before mass production) showed no issues, we lately observed a presence of very large signal pulses (similar to 5000 x single photon signal), generated internally within about 20% of HAPDs, while operating in the magnetic field. The rate of these pulses varies from sample to sample. These pulses impact the HAPD performance in two ways: they introduce periods Of dead time and, in some cases, damage to the front-end electronics was observed. Here we present conditions under which such large pulses are generated, their properties and impact on HAPD performance, and discuss possible mechanism of their origin. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2016.06.037

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  • Belle II 実験 ARICH 用光検出器 HAPD の磁場中の動作特性

    小川 和也, 遊佐 洋右, 片浦 隆介, 小林 哲也, 吉澤 司人, 足立 一郎, 西田 昌平, Santelj Luka, 今野 智之, 庄子 正剛, 飯嶋 徹, 住吉 孝行, 角野 秀一, 汲田 哲郎, 岩田 修一, 米永 匡伸, 幡谷 航暉, 野口 光太, 池田 博一, 河合 秀幸, 田端 誠, 小川 了, 庵 翔太, 金道 玄樹, 町田 聖寛

    日本物理学会講演概要集   72 ( 0 )   98 - 98   2017年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本物理学会  

    &lt;p&gt;Belle II実験のARICHでは真空管とシリコン検出器のハイブリッド構造を持つ光検出器HAPDが磁場中で使用される。試作品を用いた先行研究では、磁場中においてバックグラウンドが抑制されることが測定されていた。しかし、一部の量産品において、磁場の影響で真空管内の光電子軌道が変化してパルスが生じることが新たに判明した。本講演では、量産されたHAPDの磁場によるパルスの影響と対策について報告する。&lt;/p&gt;

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  • Particle identification performance of the prototype aerogel RICH counter for the Belle II experiment

    S. Iwata, I. Adachi, K. Hara, T. Iijima, H. Ikeda, H. Kakuno, H. Kawai, T. Kawasaki, S. Korpar, S. Korpar, P. Križan, P. Križan, T. Kumita, S. Nishida, S. Ogawa, R. Pestotnik, L. Šantelj, A. Seljak, T. Sumiyoshi, M. Tabata, E. Tahirovic, Y. Yusa

    Progress of Theoretical and Experimental Physics   2016   2016年3月

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    © The Author(s) 2016. We have developed a new type of particle identification device, called an aerogel ring imaging Cherenkov (ARICH) counter, for the Belle II experiment. It uses silica aerogel tiles as Cherenkov radiators. For detection of Cherenkov photons, hybrid avalanche photo-detectors (HAPDs) are used. The designed HAPD has a high sensitivity to single photons under a strong magnetic field. We have confirmed that the HAPD provides high efficiency for single-photon detection even after exposure to neutron and γ -ray radiation that exceeds the levels expected in the 10-year Belle II operation. In order to confirm the basic performance of the ARICH counter system, we carried out a beam test at the using a prototype of the ARICH counter with six HAPD modules. The results are in agreement with our expectations and confirm the suitability of the ARICH counter for the Belle II experiment. Based on the in-beam performance of the device, we expect that the identification efficiency at 3.5GeV/c is 97.4% and 4.9% for pions and kaons, respectively. This paper summarizes the development of the HAPD for the ARICH and the evaluation of the performance of the prototype ARICH counter built with the final design components.

    DOI: 10.1093/ptep/ptw005

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  • 19pCA-6 Belle II実験A-RICH用光検出器の磁場中におけるバックグラウンド調査

    小川 和也, 遊佐 洋右, 小林 哲也, 片浦 隆介, 足立 一郎, 西田 昌平, Santelj Luka, 飯嶋 徹, 池田 博一, 河合 秀幸, 田端 誠, 小川 了, 庵 翔太, 住吉 孝行, 角野 秀一, 汲田 哲郎, 岩田 修一, 米永 匡伸, 幡谷 航暉, 金道 玄樹

    日本物理学会講演概要集   71 ( 0 )   2016年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本物理学会  

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  • Development of a 144-channel hybrid avalanche photo-detector for Belle II ring-imaging Cherenkov counter with an aerogel radiator

    S. Nishida, I. Adachi, N. Hamada, K. Hara, T. Iijima, S. Iwata, H. Kakuno, H. Kawai, S. Korpar, P. Krizan, S. Ogawa, R. Pestotnik, L. ͈antelj, A. Seljak, T. Sumiyoshi, M. Tabata, E. Tahirovic, K. Yoshida, Y. Yusa

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   787   59 - 63   2015年7月

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    © 2014 Elsevier B.V. All rights reserved. Abstract The Belle II detector, a follow up of the very successful Belle experiment, is under construction at the SuperKEKB electron-positron collider at KEK in Japan. For the PID system in the forward region of the spectrometer, a proximity-focusing ring-imaging Cherenkov counter with an aerogel radiator is being developed. For the position sensitive photon sensor, a 144-channel Hybrid Avalanche Photo-Detector has been developed with Hamamatsu Photonics K.K. In this report, we describe the specification of the Hybrid Avalanche Photo-Detector and the status of the mass production.

    DOI: 10.1016/j.nima.2014.11.018

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  • 23pDL-7 Bell II実験Aerogel RICH用光検出器HAPDによるチェレンコフ放射角分布のバックグラウンド解析

    片浦 隆介, 遊佐 洋右, 川崎 健夫, 小林 哲也, 足立 一郎, 西田 昌平, Santelj Luka, 飯嶋 徹, 池田 博一, 河合 秀幸, 田端 誠, 小川 了, 庵 翔太, Korpar Samo, Pestotnikr Rok, 住吉 孝行, 角野 秀一, 汲田 哲郎, 岩田 修一, 吉田 圭佑

    日本物理学会講演概要集   70 ( 0 )   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本物理学会  

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  • A 144-channel HAPD for the Aerogel RICH at Belle II

    S. Korpar, S. Korpar, I. Adachi, N. Hamada, M. Higuchi, T. Iijima, S. Iwata, H. Kakuno, H. Kawai, P. Križan, P. Križan, S. Nishida, S. Ogawa, R. Pestotnik, L. Šantelj, A. Stanovnik, A. Seljak, T. Sumiyoshi, M. Tabata, E. Tahirovič, K. Yoshida, Y. Yusa

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   766   145 - 147   2014年12月

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    © 2014 Elsevier B.V. A hybrid photo-detector (HAPD) has been developed for the aerogel RICH (ARICH) of the Belle II experiment. In the present contribution we report the performance tests in magnetic fields, results of the neutron and gamma irradiation studies, and of aging tests. We also review the production status and plans.

    DOI: 10.1016/j.nima.2014.05.060

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  • Aerogel RICH for the Belle II forward PID

    S. Nishida, I. Adachi, N. Hamada, K. Hara, T. Iijima, S. Iwata, H. Kakuno, H. Kawai, S. Korpar, P. Krizan, S. Ogawa, R. Pestotnik, L. ͈antelj, A. Seljak, T. Sumiyoshi, M. Tabata, E. Tahirovic, K. Yoshida, Y. Yusa

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   766   28 - 31   2014年12月

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    ©2014 Elsevier B.V. All rights reserved. The Belle II spectrometer, a follow up of the very successful Belle experiment, is under construction at the SuperKEKB electron-positron collider at KEK in Japan. For the PID system in the forward region of the spectrometer, a proximity focusing ring-imaging Cherenkov (RICH) counter with an aerogel radiator is being developed. The counter will provide a 4σ separation of pions and kaons up to momenta of 4 GeV/c. For the position sensitive photon sensor, a 144-channel Hybrid Avalanche Photo-Detector (HAPD) has been developed with Hamamatsu Photonics K.K. The readout electronics is based on the custom developed ASIC. The design of the components is currently being finalized and part of their mass production have already started. Herein, we report the final design of the counter and a prototype test conducted with test beams at DESY.

    DOI: 10.1016/j.nima.2014.06.061

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  • Measurement of time-dependent CP violation in B&lt;sup&gt;0&lt;/sup&gt; → η′K&lt;sup&gt;0&lt;/sup&gt; decays

    A. Zupanc, L. Šantelj, Y. Yusa, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, S. Bahinipati, A. M. Bakich, V. Bansal, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Doležal, Z. Drásal, A. Drutskoy, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, R. Glattauer, Y. M. Goh, B. Golob, J. Haba, K. Hara, K. Hayasaka, H. Hayashii, X. H. He, T. Higuchi, W. S. Hou, H. J. Hyun, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, K. K. Joo, H. Kakuno, E. Kato, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, J. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, D. Matvienko, K. Miyabayashi, H. Miyata, G. B. Mohanty, A. Moll, T. Mori, E. Nakano, M. Nakao, T. Nanut, Z. Natkaniec, E. Nedelkovska, N. K. Nisar, S. Nishida

    Journal of High Energy Physics   2014   2014年1月

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    © 2014, The Author(s). Abstract: We present a measurement of the time-dependent CP violation parameters in B&lt;sup&gt;0&lt;/sup&gt; → η′K&lt;sup&gt;0&lt;/sup&gt; decays. The measurement is based on the full data sample containing 772 × 10&lt;sup&gt;6&lt;/sup&gt; (Formula Presented.) pairs collected at the Υ(4S) resonance using the Belle detector at the KEKB asymmetric-energy e&lt;sup&gt;+&lt;/sup&gt;e&lt;sup&gt;−&lt;/sup&gt; collider. The measured values of the mixing-induced and direct CP violation parameters are: (Formula Presented.) (Formula Presented.) where the first uncertainty is statistical and the second is systematic. The values obtained are the most accurate to date. Furthermore, these results are consistent with our previous measurements and with the world-average value of sin 2ϕ&lt;inf&gt;1&lt;/inf&gt; measured in B&lt;sup&gt;0&lt;/sup&gt; → J/ψK&lt;sup&gt;0&lt;/sup&gt; decays.

    DOI: 10.1007/JHEP10(2014)165

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  • 21pSD-6 Belle実験によるB^0→η'K^*0(892)の崩壊分岐比測定(B・チャーム物理,素粒子実験領域)

    佐藤 駿, 遊佐 洋右

    日本物理学会講演概要集   68 ( 2 )   20 - 20   2013年8月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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講演・口頭発表等

  • チェレンコフ光のリングイメージを使った粒子の入射方向測定装置の開発

    遊佐洋右

    日本物理 学会第79回年次大会  2024年9月 

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    会議種別:口頭発表(一般)  

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  • チェレンコフ光を用いたガンマカメラの開発

    遊佐洋右

    日本物理学会第78回年次大会  2023年9月 

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    会議種別:口頭発表(一般)  

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  • Summary of WG4: Mixing and mixing-related CP violation in B system 招待

    Yosuke Yusa

    11th International Workshop on the CKM Unitarity Triangle (CKM2021)  2021年11月 

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    会議種別:口頭発表(基調)  

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  • Time-dependent studies with early Belle II data 招待

    Yosuke Yusa

    18th International Conference on B-Physics at Frontier Machines (Beauty 2019)  2019年9月 

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    会議種別:口頭発表(一般)  

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  • 本実験を開始したSuperKEKB/Belle II: 測定器の性能と物理解析の状況 招待

    遊佐洋右

    日本物理学会2019年秋季大会  2019年9月 

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    会議種別:口頭発表(招待・特別)  

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  • Time-dependent CP violation in B decays at Belle 招待

    Yosuke Yusa

    The 2019 European Physical Society Conference on High Energy Physics (EPS-HEP 2019)  2019年7月 

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    会議種別:口頭発表(一般)  

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  • Study of CP violation in B meson decays 国際会議

    遊佐 洋右

    XIV International Conference on Heavy Quarks and Leptons (HQL 2018)  2018年5月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • 新型光検出器を用いたSPECT用γ線検出器の開発研究

    遊佐 洋右

    日本物理学会第73回年次大会  2018年3月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • 新型光検出器を用いたSPECT装置の開発研究

    遊佐 洋右

    日本物理学会2016年秋季大会  2016年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • Overview of Flavor Physics Results at Belle 国際会議

    遊佐 洋右

    3rd International Conference on New Frontiers in Physics (ICNFP 2014)  2014年7月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • ARICH for Belle II 国際会議

    遊佐 洋右

    The International Conference on Instrumentation for Colliding Beam Physics (INSTR 2014)  2014年2月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • 新開発光検出器HAPDの量子効率測定システムの開発研究

    遊佐 洋右

    日本物理学会2013年秋季大会  2013年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • B0->eta'K0崩壊におけるCP対称性の破れの測定

    遊佐 洋右

    日本物理学会2013年秋季大会  2013年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • The ARICH detector at Belle II experiment 国際会議

    遊佐 洋右

    The 2013 European Physical Society Conference on High Energy Physics (EPS-HEP 2013)  2013年7月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Time-dependent CP Violation measurements at Belle 国際会議

    遊佐 洋右

    11th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2012)  2012年5月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Experience for long time operation of Belle KLM 国際会議

    遊佐 洋右

    Asian Forum for Accelerators and Detectors Workshop (AFAD-2012)  2012年2月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • CP violation in B decays with Belle and BABAR 国際会議

    遊佐 洋右

    23rd Rencontres de Blois Particle Physics and Cosmology (Blois 2011)  2011年5月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • CPV in Belle/BaBar part-2 国際会議

    遊佐 洋右

    10th International Conference on Heavy Quarks and Leptons (HQL2010)  2010年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Belle の最近の物理結果 招待

    遊佐 洋右

    日本物理学会 2010 年秋季大会  2010年9月 

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

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  • SuperKEKB/Belle II 国際会議

    遊佐 洋右

    Lake Louise Winter Institute 2010 (LLWI 2010)  2010年2月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • CP violation from B decays 国際会議

    遊佐 洋右

    Physics in Collision (PIC 2009)  2009年8月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Measurement of Beta 国際会議

    遊佐 洋右

    Flavor Physics and CP Violation (FPCP 2009)  2009年5月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • BELLE muon identification 国際会議

    遊佐 洋右

    10-th International Conference on Instrumention for Colliding Beam Physics (INSTR08)  2008年2月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Studies of penguin dominated B decays 国際会議

    遊佐 洋右

    The 15th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY07)  2007年7月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Measurement of phi1 in b→ccs and sss decays from Belle 国際会議

    遊佐 洋右

    Lake Louise Winter Institute 2007 (LLWI 2007)  2007年2月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Time-dependent CP asymmetries in B0→η'K0, φK0, K+K-KS, KSKSKS decays at Belle 国際会議

    遊佐 洋右

    Joint Meeting of Pacific Region Particle Physics Communities (JPS/DPF 2006)  2006年11月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Search for Tau-> lhh 国際会議

    遊佐 洋右

    8th International Workshop on Tau Lepton Physics (TAU04)  2004年9月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Search for neutrinoless tau decays to three charged final state at Belle 国際会議

    遊佐 洋右

    7th International Workshop on Tau Lepton Physics (TAU02)  2002年9月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Search for neutrinoless tau decays to three charged final state at Belle 国際会議

    遊佐 洋右

    American Physical Society's 2002 Meeting of The Division of Particles and Fields (DPF2002)  2002年5月 

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    記述言語:英語   会議種別:口頭発表(一般)  

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受賞

  • 学長賞

    2015年11月   新潟大学   Observation of the decay B 0 →η ‘ K *(892) 0

    遊佐 洋右

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共同研究・競争的資金等の研究

  • 金型製フレネルレンズを用いたチェレンコフ光リングイメージ放射線検出器の小型化へ向けた開発

    2024年4月 - 2026年3月

    提供機関:公益財団法人内田エネルギー科学振興財団

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    担当区分:研究代表者 

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  • 新たなコンセプトを導入したガンマ線源撮像装置の開発研究

    2023年4月 - 2025年3月

    提供機関:公益財団法人高橋産業経済研究財団

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    担当区分:研究代表者 

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  • 新型光検出器を用いたSPECT用高分解能γ線源位置検出器の開発

    2016年4月 - 2018年3月

    制度名:科学研究費助成事業

    提供機関:日本学術振興会

    遊佐 洋右

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

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  • 新型光検出器を用いた高性能放射線撮像 検出器の製作研究

    2015年4月 - 2016年3月

    制度名:試験研究費助成

    提供機関:公益財団法人内田エネルギー科学振興財団

    遊佐 洋右

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

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  • Belle‐II実験のための高性能新型粒子識別装置の開発

    2012年4月 - 2016年3月

    制度名:科学研究費助成事業

    提供機関:日本学術振興会

    住吉 孝行

      詳細を見る

    資金種別:競争的資金

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担当経験のある授業科目(researchmap)

  • 物理学学習法

    機関名:新潟大学

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  • 医学物理学入門

    機関名:新潟大学

     詳細を見る

  • 医学物理学特論

    機関名:新潟大学

     詳細を見る

  • 物理学基礎実験

    機関名:新潟大学

     詳細を見る

  • 物理学実験

    機関名:新潟大学

     詳細を見る

  • 素粒子物理学

    機関名:新潟大学

     詳細を見る

  • 放射線計測学特論

    機関名:新潟大学

     詳細を見る

  • 放射線物理学特論

    機関名:新潟大学

     詳細を見る

▶ 全件表示

担当経験のある授業科目

  • 放射線物理学特論

    2022年
    機関名:新潟大学

  • 理学スタディ・スキルズ

    2022年
    機関名:新潟大学

  • 自然科学基礎実験

    2021年
    -
    現在
    機関名:新潟大学

  • 実験素粒子物理学I

    2021年
    機関名:新潟大学

  • 放射線計測学特論

    2021年
    機関名:新潟大学

  • 医学物理学総論

    2020年
    -
    現在
    機関名:新潟大学

  • 物理学実験C

    2020年
    -
    現在
    機関名:新潟大学

  • 現代物理学セミナーA

    2020年
    -
    現在
    機関名:新潟大学

  • 物理学実験B

    2020年
    -
    現在
    機関名:新潟大学

  • 物理学実験A

    2020年
    -
    現在
    機関名:新潟大学

  • 現代物理学セミナーB

    2020年
    -
    現在
    機関名:新潟大学

  • 放射線物理学特論

    2020年
    -
    2022年
    機関名:新潟大学

  • 物理学実験D

    2020年
    -
    2022年
    機関名:新潟大学

  • 素粒子物理学

    2019年
    -
    現在
    機関名:新潟大学

  • 素粒子物理学II

    2018年
    機関名:新潟大学

  • 専門力アクティブ・ラーニング

    2018年
    機関名:新潟大学

  • 物理学基礎実習a

    2017年
    -
    現在
    機関名:新潟大学

  • 医学物理学特論

    2017年
    -
    現在
    機関名:新潟大学

  • 物理学基礎実習b

    2017年
    -
    現在
    機関名:新潟大学

  • 理学スタディ・スキルズ

    2017年
    -
    2022年
    機関名:新潟大学

  • 医学物理学入門

    2015年
    -
    現在
    機関名:新潟大学

  • 素粒子物理学I

    2014年
    -
    2017年
    機関名:新潟大学

  • 現代物理学への招待(物理学学習法)

    2014年
    -
    2016年
    機関名:新潟大学

  • 数理物質科学特定研究ⅡA(物理学)

    2013年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学演習Ⅱ(物理学)

    2013年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学特定研究ⅡB(物理学)

    2013年
    -
    2015年
    機関名:新潟大学

  • 初等物理学実験

    2012年
    -
    2016年
    機関名:新潟大学

  • 物理学基礎実験

    2012年
    -
    2016年
    機関名:新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • コラボレーション演習

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • リサーチキャンプ

    2012年
    機関名:新潟大学

  • 物理学実験a

    2012年
    機関名:新潟大学

  • 物理学実験b

    2012年
    機関名:新潟大学

▶ 全件表示

 

社会貢献活動

  • 非対称で物質だらけの奇妙な?この宇宙

    役割:講師

    サイエンスカフェつばめ  2016年10月

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  • ガイガーカウンターを用いた放射線の測定

    役割:講師, 助言・指導

    新潟県教育委員会  新潟県高校生理数トップセミナー  2015年11月 - 2015年12月

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  • 物理で遊ぼう

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