Updated on 2024/04/25

写真a

 
YUSA Yousuke
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Assistant Professor
Faculty of Science Department of Science Assistant Professor
Title
Assistant Professor
External link

Degree

  • 博士（理学） ( 2005.3   東北大学 )

Research Interests

  • B meson

  • High energy experiment

  • Particle identification

  • Photon detector

  • Medical physics

  • CP asymmetry

Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

  • Life Science / Radiological sciences

  • Energy Engineering / Quantum beam science

Research History (researchmap)

  • Niigata University   Graduate School of Science and Technology   Assistant Professor

    2011.4

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  • Virginia Polytechnic Institute and State University   Postdoc associate

    2005.9 - 2011.3

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  • Tohoku University   Faculty of Science   Researcher

    2005.5 - 2005.9

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Research History

  • Niigata University   Faculty of Science Department of Science   Assistant Professor

    2020.4

  • Niigata University   Faculty of Science Department of Physics   Assistant Professor

    2011.4 - 2020.3

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences Physics   Assistant Professor

    2011.4 - 2020.3

Education

  • Tohoku University   Graduate School of Science

    2000.4 - 2005.3

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  • Tohoku University   Faculty of Science   Department of Physics

    1996.4 - 2000.3

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Professional Memberships

 

Papers

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

    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   2017.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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 Reviewed

    Yosuke Yusa

    3RD INTERNATIONAL CONFERENCE ON NEW FRONTIERS IN PHYSICS   95   2015

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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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  • Observation of the decay B-0 -> eta ' K* (892)(0) Reviewed

    Yosuke Yusa

    PHYSICAL REVIEW D   90 ( 7 )   2014.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevD.90.072009

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

    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 )   2014.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

    We present a measurement of the time-dependent CP violation parameters in B0 -> 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 -> J/psi K-0 decays.

    DOI： 10.1007/JHEP10(2014)165

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  • ARICH for Belle II Reviewed

    Y. Yusa

    JOURNAL OF INSTRUMENTATION   9   2014.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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  • Search for lepton-flavor and lepton-number-violating Τ→ℓhh' decay modes Reviewed

    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   2013.2

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

    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 )   2012.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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  • Measurement of CP asymmetries in B-0 -&gt; K-0 pi(0) decays Reviewed

    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 )   2010.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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  • Belle muon identification Reviewed

    Y. Yusa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   598 ( 1 )   183 - 186   2009.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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 Reviewed

    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 )   2007.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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  • Search for neutrinoless decays tau -&gt; lhh and tau -&gt; lV(0) Reviewed

    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   2006.9

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    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 Reviewed

    Y Yusa

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   144   173 - 178   2005.7

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    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 Reviewed

    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   2004.6

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

    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   2003.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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) Reviewed

    Y Yusa, H Hayashii, T Nagamine, A Yamaguchi

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   123   95 - 101   2003.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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  • Muon identification in the Belle experiment at KEKB Reviewed

    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   2002.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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  • A search for a freonless gas mixture for glass RPC Reviewed

    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   2001.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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Presentations

  • Study of CP violation in B meson decays International conference

    Yosuke Yusa

    XIV International Conference on Heavy Quarks and Leptons (HQL 2018)  2018.5 

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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  2018.3 

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    Language：Japanese   Presentation type：Oral presentation (general)  

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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  2016.9 

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  • Overview of Flavor Physics Results at Belle International conference

    Yosuke Yusa

    3rd International Conference on New Frontiers in Physics (ICNFP 2014)  2014.7 

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  • ARICH for Belle II International conference

    Yosuke Yusa

    The International Conference on Instrumentation for Colliding Beam Physics (INSTR 2014)  2014.2 

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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  2013.9 

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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  2013.9 

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  • The ARICH detector at Belle II experiment International conference

    Yosuke Yusa

    The 2013 European Physical Society Conference on High Energy Physics (EPS-HEP 2013)  2013.7 

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  • Time-dependent CP Violation measurements at Belle International conference

    Yosuke Yusa

    11th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2012)  2012.5 

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  • Experience for long time operation of Belle KLM International conference

    Yosuke Yusa

    Asian Forum for Accelerators and Detectors Workshop (AFAD-2012)  2012.2 

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    Language：English   Presentation type：Oral presentation (invited, special)  

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  • CP violation in B decays with Belle and BABAR International conference

    Yosuke Yusa

    23rd Rencontres de Blois Particle Physics and Cosmology (Blois 2011)  2011.5 

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  • CPV in Belle/BaBar part-2 International conference

    Yosuke Yusa

    10th International Conference on Heavy Quarks and Leptons (HQL2010)  2010.10 

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  • Recent result in Belle experiment Invited

    Yosuke Yusa

    Japan Physics Society meeting in autumn 2010  2010.9 

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  • SuperKEKB/Belle II International conference

    Yosuke Yusa

    Lake Louise Winter Institute 2010 (LLWI 2010)  2010.2 

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  • CP violation from B decays International conference

    Yosuke Yusa

    Physics in Collision (PIC 2009)  2009.8 

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  • Measurement of Beta International conference

    Yosuke Yusa

    Flavor Physics and CP Violation (FPCP 2009)  2009.5 

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  • BELLE muon identification International conference

    Yosuke Yusa

    10-th International Conference on Instrumention for Colliding Beam Physics (INSTR08)  2008.2 

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  • Studies of penguin dominated B decays International conference

    Yosuke Yusa

    The 15th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY07)  2007.7 

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  • Measurement of phi1 in b→ccs and sss decays from Belle International conference

    Yosuke Yusa

    Lake Louise Winter Institute 2007 (LLWI 2007)  2007.2 

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

    Yosuke Yusa

    Joint Meeting of Pacific Region Particle Physics Communities (JPS/DPF 2006)  2006.11 

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  • Search for Tau-> lhh International conference

    Yosuke Yusa

    8th International Workshop on Tau Lepton Physics (TAU04)  2004.9 

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  • Search for neutrinoless tau decays to three charged final state at Belle International conference

    Yosuke Yusa

    7th International Workshop on Tau Lepton Physics (TAU02)  2002.9 

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  • Search for neutrinoless tau decays to three charged final state at Belle International conference

    Yosuke Yusa

    American Physical Society's 2002 Meeting of The Division of Particles and Fields (DPF2002)  2002.5 

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Awards

  • President Award

    2015.11   Niigata University   Observation of the decay B 0 →η ‘ K *(892) 0

    Yosuke Yusa

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Research Projects

  • 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

    2016.4 - 2018.3

    System name：科学研究費助成事業

    Awarding organization：日本学術振興会

    遊佐 洋右

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    Authorship：Principal investigator  Grant type：Competitive

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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

    2015.4 - 2016.3

    System name：試験研究費助成

    Awarding organization：公益財団法人内田エネルギー科学振興財団

    遊佐 洋右

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    Authorship：Principal investigator  Grant type：Competitive

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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

    2012.4 - 2016.3

    System name：科学研究費助成事業

    Awarding organization：日本学術振興会

    住吉 孝行

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    Grant type：Competitive

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Teaching Experience (researchmap)

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Teaching Experience

  • 放射線物理学特論

    2022
    Institution name：新潟大学

  • 理学スタディ・スキルズ

    2022
    Institution name：新潟大学

  • 自然科学基礎実験

    2021
    Institution name：新潟大学

  • 実験素粒子物理学I

    2021
    Institution name：新潟大学

  • 放射線計測学特論

    2021
    Institution name：新潟大学

  • 物理学実験A

    2020
    Institution name：新潟大学

  • 現代物理学セミナーB

    2020
    Institution name：新潟大学

  • 現代物理学セミナーA

    2020
    Institution name：新潟大学

  • 医学物理学総論

    2020
    Institution name：新潟大学

  • 物理学実験C

    2020
    Institution name：新潟大学

  • 物理学実験B

    2020
    Institution name：新潟大学

  • 放射線物理学特論

    2020
    -
    2022
    Institution name：新潟大学

  • 物理学実験D

    2020
    -
    2022
    Institution name：新潟大学

  • 素粒子物理学

    2019
    Institution name：新潟大学

  • 素粒子物理学II

    2018
    Institution name：新潟大学

  • 専門力アクティブ・ラーニング

    2018
    Institution name：新潟大学

  • 物理学基礎実習b

    2017
    Institution name：新潟大学

  • 物理学基礎実習a

    2017
    Institution name：新潟大学

  • 医学物理学特論

    2017
    Institution name：新潟大学

  • 理学スタディ・スキルズ

    2017
    -
    2022
    Institution name：新潟大学

  • 医学物理学入門

    2015
    Institution name：新潟大学

  • 素粒子物理学I

    2014
    -
    2017
    Institution name：新潟大学

  • 現代物理学への招待(物理学学習法)

    2014
    -
    2016
    Institution name：新潟大学

  • 数理物質科学特定研究ⅡA(物理学)

    2013
    -
    2015
    Institution name：新潟大学

  • 数理物質科学演習Ⅱ(物理学)

    2013
    -
    2015
    Institution name：新潟大学

  • 数理物質科学特定研究ⅡB(物理学)

    2013
    -
    2015
    Institution name：新潟大学

  • 初等物理学実験

    2012
    -
    2016
    Institution name：新潟大学

  • 物理学基礎実験

    2012
    -
    2016
    Institution name：新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2012
    -
    2015
    Institution name：新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2012
    -
    2015
    Institution name：新潟大学

  • コラボレーション演習

    2012
    -
    2015
    Institution name：新潟大学

  • リサーチキャンプ

    2012
    Institution name：新潟大学

  • 物理学実験a

    2012
    Institution name：新潟大学

  • 物理学実験b

    2012
    Institution name：新潟大学

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Social Activities

  • 非対称で物質だらけの奇妙な？この宇宙

    Role(s)： Lecturer

    サイエンスカフェつばめ  2016.10

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  • ガイガーカウンターを用いた放射線の測定

    Role(s)： Lecturer,　Advisor

    新潟県教育委員会  新潟県高校生理数トップセミナー  2015.11 - 2015.12

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  • 物理で遊ぼう

    Role(s)： Demonstrator

    青少年のための科学の祭典新潟大会実行委員会、(公財)日本科学技術振興財団・科学技術館  青少年のための科学の祭典 新潟県大会  2012.2

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