Updated on 2025/10/09

写真a

 
KOIKE Yuji
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Professor
Graduate School of Science and Technology Fundamental Sciences Professor
Faculty of Science Department of Science Professor
Title
Professor
External link

Degree

  • 理学博士 ( 1988.3   東京大学 )

Research Interests

  • パートン分布・破砕関数

  • パートン間量子多体相関

  • スピン非対称

  • ハドロン構造

  • 摂動QCD

  • 高エネルギーハドロン反応

Research Areas

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

Research History (researchmap)

  • Niigata University   Faculty of Science Department of Science   Professor

    2017.4

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

    2011.11

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  • Niigata University   Faculty of Science

    1999.2 - 2011.10

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  • 新潟大学 自然科学研究科 助手

    1994.4 - 1999.2

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  • Michigan State University   Research Associate

    1992.9 - 1994.3

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  • The University of Maryland   Research Associate

    1990.9 - 1992.8

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  • Massachusetts Institute of Technology   Sponsored Research Staff

    1988.9 - 1990.8

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  • The University of Tokyo   Faculty of Science

    1988.4 - 1988.8

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  • The University of Tokyo   Faculty of Science

    1987.4 - 1988.3

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Research History

  • Niigata University   Faculty of Science Department of Science   Professor

    2017.4

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

    2011.11

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

    2011.11

  • Niigata University   Faculty of Science Department of Physics   Professor

    2011.11 - 2017.3

  • Niigata University   Faculty of Science Department of Physics   Associate Professor

    1999.2 - 2011.10

  • Niigata University   Faculty of Science Department of Physics   Research Assistant

    1998.5 - 1999.1

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1994.4 - 1998.5

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Education

  • The University of Tokyo   Graduate School, Division of Science

    1983.4 - 1988.3

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    Country: Japan

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  • The University of Tokyo   Faculty of Science   物理学科

    1979.4 - 1983.3

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    Country: Japan

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Professional Memberships

 

Papers

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Books

MISC

  • Collinear Twist-3 Approach to Hyperon Polarization in SIDIS Reviewed

    Kazuki Takada, Yuji Koike, Sumire Usui, Kenta Yabe, Shinsuke Yoshida

    Proceedings of the 24th International Spin Symposium (SPIN2021)   37   020302   2022.12

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    Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.37.020302

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  • Twist-3 Gluon Fragmentation Contribution to Polarized Hyperon Production and its Frame Independence Reviewed

    Yuji Koike, Kenta Yabe, Shinsuke Yoshida

    Proceedings of the 24th International Spin Symposium (SPIN2021)   37   020114   2022.12

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    Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.37.020114

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  • Transverse Polarization of Hyperons in SIDIS from Twist-3 Gluon Fragmentation Functions Reviewed

    Riku Ikarashi, Yuji Koike, Kenta Yabe, Shinsuke Yoshida

    Proceedings of the 24th International Spin Symposium (SPIN2021)   37   020113   2022.12

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    Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.37.020113

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  • Twist-3 gluon fragmentation contribution to transversely polarized hyperon production in semi-inclusive deep-inelastic scattering Reviewed

    Riku Ikarashi, Yuji Koike, Kenta Yabe, Shinsuke Yoshida

    Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)   PANIC2021   370   2022.3

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    Publisher:Sissa Medialab  

    DOI: 10.22323/1.380.0370

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  • Keyword: Twist-3 Reviewed

    Yuji Koike

    66 ( 2 )   74 - 75   2022.3

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  • Twist-3 Gluon Fragmentation Contribution to the Polarized Hyperon Production in Unpolarized Proton–Proton Collision Reviewed

    Kenta Yabe, Yuji Koike, Andreas Metz, Daniel Pitonyak, Shinsuke Yoshida

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)   2019.11

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (international conference proceedings)   Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.26.021016

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  • Twist-3 fragmentation contribution to polarized hyperon production in unpolarized proton-proton collision Reviewed

    Yabe Kenta, Yuji Koike, Andreas Metz, Daniel Pitonyak, Shinsuke Yoshida

    Proceedings of 23rd International Spin Physics Symposium — PoS(SPIN2018)   192 - 196   2019.8

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    Publisher:Sissa Medialab  

    DOI: 10.22323/1.346.0192

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  • Twist-3 asymmetries in proton-proton collisions Reviewed

    KOIKE Yuji

    PoS QCDEV   2016 ( 029 )   2017

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    Language:English  

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  • Twist-3 Spin Asymmetries And Parton Correlations In High-energy Processes Reviewed

    KOIKE Yuji

    Pos INPC   2016 ( 312 )   2017

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    Language:English  

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  • Lorentz invariance relations for twist-3 functions and frame-independence of twist-3 cross sections Reviewed

    Yuji Koike, Koichi Kanazawa, Andreas Metz, Daniel Pitonyak, Marc Schlegel

    Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)   2016 ( 220 )   2016.11

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    Language:English   Publisher:Sissa Medialab  

    DOI: 10.22323/1.265.0220

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  • Twist-3 approach to hyperon polarization in unpolarized proton-proton collision Reviewed

    K. Yabe, Y. Koike, S. Yoshida

    PoS DIS   2016 ( 222 )   2016

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    Language:English  

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  • Collinear Twist-3 Approach to Transverse Single-Spin Asymmetry in Proton-Proton Collision

    Koichi Kanazawa, Andreas Metz, Yuji Koike, Daniel Pitonyak

    Proceedings of 12th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2015), Vail, Colorado, USA   2015.9

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    Publishing type:Internal/External technical report, pre-print, etc.  

    We present our recent analysis on the transverse single-spin asymmetry (SSA)<br />
    in inclusive pion and direct-photon production in pp collisions for RHIC<br />
    kinematics. The analysis includes the contributions from twist-3<br />
    quark-gluon-quark correlations in the proton and twist-3 fragmentation effects<br />
    for the pion. Some of the functions appearing in the formula for the SSA, such<br />
    as the soft-gluon-pole Qiu-Sterman function, the nucleon transversity, and the<br />
    Collins function were fixed consistently with the SSA data in semi-inclusive<br />
    DIS and in e+e- annihilation, so that our analysis is free from the sign<br />
    mismatch problem.

    DOI: 10.1155/2015/257934

    arXiv

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  • New Collinear Twist-3 Analysis of Transverse SSA: Toward a Solution for the Sign-Mismatch Problem Reviewed

    Koichi Kanazawa, Yuji Koike, Andreas Metz, Daniel Pitonyak

    FEW-BODY SYSTEMS   56 ( 6-9 )   343 - 348   2015.9

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  • A(N) in proton-proton collisions and the role of twist-3 fragmentation Reviewed

    Daniel Pitonyak, Koichi Kanazawa, Yuji Koike, Andreas Metz

    4TH INTERNATIONAL WORKSHOP ON TRANSVERSE POLARISATION PHENOMENA IN HARD PROCESSES (TRANSVERSITY 2014)   85   2015

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  • The role of three-gluon correlation functions in the single spin asymmetry Reviewed

    Hiroo Beppu, Koichi Kanazawa, Yuji Koike, Shinsuke Yoshida

    4TH INTERNATIONAL WORKSHOP ON TRANSVERSE POLARISATION PHENOMENA IN HARD PROCESSES (TRANSVERSITY 2014)   85   2015

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  • Transverse Single-Spin Asymmetries in Proton-Proton Collisions Within Collinear Factorization Invited Reviewed

    D. Pitonyak, K. Kanazawa, Y. Koike, A. Metz

    Int. J. Mod. Phys. Conf. Ser.   37 ( 1560033 )   2015

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (international conference proceedings)  

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  • Twist-3 quark-gluon correlation contribution to single-transverse spin asymmetry for direct-photon and single-jet productions in pp collision Reviewed

    K. Kanazawa, Y. Koike

    PHYSICS OF PARTICLES AND NUCLEI   45 ( 1 )   82 - 84   2014.1

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  • Contribution of the twist-3 fragmentation function to single transverse-spin asymmetry in SIDIS

    Koichi Kanazawa, Yuji Koike

    PoS DIS   2013   245   2013.6

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (international conference proceedings)  

    We study the contribution of the twist-3 fragmentation function to the single<br />
    transverse-spin asymmetry in SIDIS within the framework of the collinear<br />
    factorization. Using the Ward-Takahashi identity in QCD, we establish the<br />
    collinear twist-3 formalism in the Feynman gauge to calculate its non-pole<br />
    contribution to the asymmetry.

    arXiv

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  • Twist-3 approach to single transverse-spin asymmetry Reviewed

    K. Kanazawa, Y. Koike

    Nuovo Cimento della Societa Italiana di Fisica C   36 ( 5 )   101 - 104   2013

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    Language:English   Publisher:Editrice Compositori s.r.l.  

    DOI: 10.1393/ncc/i2013-11581-7

    Scopus

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  • Probing the multi-gluon correlations through single-spin asymmetries Reviewed

    Yuji Koike, Shinsuke Yoshida

    Nuovo Cimento della Societa Italiana di Fisica C   35 ( 2 )   137 - 142   2012

  • Probing the twist-3 multi-gluon correlation functions by p(up arrow)p -&gt; DX Reviewed

    Yuji Koike, Shinsuke Yoshida

    19TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM (SPIN2010), PT 2   295   2011

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  • A new twist-3 analysis of the single transverse-spin asymmetry for pion and kaon production at RHIC Reviewed

    Koichi Kanazawa, Yuji Koike

    19TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM (SPIN2010), PT 1   295 ( 012059 )   1 - 5   2011

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  • Probing multigluon correlations through single spin asymmetries in pp collisions Reviewed

    Yuji Koike, Shinsuke Yoshida

    8TH CIRCUM-PAN-PACIFIC SYMPOSIUM ON HIGH ENERGY SPIN PHYSICS   1418   85 - 90   2011

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  • On the contribution of twist-3 multi-gluon correlation functions to single transverse-spin asymmetry in SIDIS Reviewed

    Hiroo Beppu, Yuji Koike, Kazuhiro Tanaka, Shinsuke Yoshida

    19TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM (SPIN2010), PT 2   295 ( 012082 )   1 - 5   2011

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  • Soft-Fermion-Pole Mechanism to Single Spin Asymmetry in Hadronic Pion Production Reviewed

    Yuji Koike, Tetsuya Tomita

    SPIN PHYSICS   1149   672 - 675   2009

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    Language:English  

    Web of Science

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  • Twist-3 Single-Spin Asymmetry for SIDIS and its Azimuthal Structure Reviewed

    Yuji Koike, Kazuhiro Tanaka

    SPIN PHYSICS   1149   475 - +   2009

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    Language:English  

    Web of Science

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  • Double-Spin Asymmetry A(LT) for Polarized Drell-Yan Process in pp Collisions: Wandzura-Wilezek Contribution Reviewed

    Yuji Koike, Kazuhiro Tanaka, Shinsuke Yoshida

    SPIN PHYSICS   1149   495 - +   2009

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  • Novel Master Formula for Twist-3 Soft-Gluon-Pole Mechanism to Single Transverse-Spin Asymmetry

    Y. Koike, K. Tanaka

    Deep-inelastic scattering (DIS2007)   623 - 626   2007.12

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  • Factorization and Gauge Invariance of Twist-3 Cross Section for Single Spin Asymmetry

    Y. Koike, K. Tanaka

    Deep-inelastic scattering (DIS2007)   619 - 622   2007.12

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  • A new approach for single transverse-spin Asymmetries from twist-3 soft-gluon mechanism Reviewed

    Yuji Koike, Kazuhiro Tanaka

    PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM   915   547 - +   2007

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  • Single transverse spin asymmetry for semi-inclusive deep inelastic scattering Reviewed

    Hisato Eguchi, Yuji Koike, Kazuhiro Tanaka

    PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM   915   529 - +   2007

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  • Q(T)-resummation for polarized semi-inclusive deep inelastic scattering Reviewed

    Yuji Koike, Junji Nagashima, Werner Vogelsang

    Deep Inelastic Scattering   779 - 782   2007

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  • Twist-3 Mechanism of Single Spin Asymmetries.

    Yuji Koike

    Proceedings of RIKEN-BNL Research Center Workshop   Vol. 75   33 - 38   2005.12

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  • シングルスピン非対称が拓くハドロン物理の新展開

    小池裕司, 齋藤直人

    日本物理学会誌   60   534 - 542   2005.7

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:日本物理学会  

    DOI: 10.11316/butsuri1946.60.534

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  • Single Transverse Spin Asymmetry in the Pion Production at RHIC and EIC.

    Yuji Koike

    Proceedings of RIKEN-BNL Research Center Workshop   Vol. 57   117 - 122   2004.12

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  • Single transverse-spin asymmetry in pp(up arrow) -&gt; pi X and ep(up arrow) -&gt; pi X

    Y Koike

    SPIN 2002   675   449 - 453   2003

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    Language:English  

    Web of Science

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  • Hyperon polarization from unpolarized pp and ep collisions

    Y Koike

    SPIN 2002   675   574 - 578   2003

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    Language:English  

    Web of Science

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  • Hyperon polarization in inclusive hadronic production

    Y Kanazawa, Y Koike

    SPIN 2000   570   494 - 498   2001

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    Language:English   Publishing type:Internal/External technical report, pre-print, etc.  

    DOI: 10.1063/1.1384108

    Web of Science

    arXiv

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  • Chiral-odd quark-parton distributions: New development in perturbative QCD.

    Yuji Koike, Kazuhiro Tanaka

    BUTSURI   53 ( 6 )   438 - 442   1998.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:Japan Physical Society  

    DOI: 10.11316/butsuri1946.53.438

    CiNii Article

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  • NLO $Q^2$-evolution of the nucleon's transversity distribution $h_1(x, Q^2)$

    A. Hayashigaki, Y. Kanazawa, Yuji Koike

    1997.10

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    We present a calculation of the two-loop anomalous dimension for the<br />
    transversity distribution $h_1(x,Q^2)$, $\gamma^{h(1)}_n$, in the MS scheme of<br />
    the dimensional regularization. Because of the chiral-odd nature, $h_1$ does<br />
    not mix with the gluon distributions, and thus our result is the same for the<br />
    flavor-singlet and nonsinglet distributions. At small $n$ (moment of $h_1$),<br />
    $\gamma^{h(1)}_n$ is significantly larger than $\gamma^{f,g(1)}_n$ (the<br />
    anomalous dimension for the nonsinglet $f_1$ and $g_1$), but approaches<br />
    $\gamma^{f,g(1)}_n$ very quickly at large $n$, keeping the relation<br />
    $\gamma^{h(1)}_n &gt; \gamma^{f,g(1)}_n$. This feature is in parallel to the<br />
    relation between the one-loop anomalous dimension for $f_1$ $(g_1)$ and $h_1$.<br />
    We also show that this difference in the anomalous dimension between $h_1$ and<br />
    $g_1$ leads to a drastic difference in the $Q^2$-evolution of those<br />
    distributions in the small $x$ region.

    arXiv

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  • $Q^2$ dependence of chiral-odd twist-3 distribution $e(x,Q^2)$

    Y. Koike, N. Nishiyama

    1996.10

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    We discuss the $Q^2$ dependence of the chiral-odd twist-3 distribution<br />
    $e(x,Q^2)$. The anomalous dimension matrix for the corresponding twist-3<br />
    operators is calculated in the one-loop level. This study completes the<br />
    calculation of the anomalous dimension matrices for all the twist-3<br />
    distributions together with the known results for the other twist-3<br />
    distributions $g_2(x,Q^2)$ and $h_L(x,Q^2)$. We also have confirmed that in the<br />
    large $N_c$ limit the $Q^2$-evolution of $e(x,Q^2)$ is wholely governed by the<br />
    lowest eigenvalue of the anomalous dimension matrix which takes a very simple<br />
    analytic form as in the case of $g_2$ and $h_L$.

    arXiv

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  • Q(2)-EVOLUTION OF NUCLEONS CHIRAL-ODD TWIST-3 SPIN-STRUCTURE FUNCTION - H(L)(X,Q(2)) Reviewed

    Y KOIKE, K TANAKA

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   ( 120 )   247 - 255   1995

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  • Hadron Properties at Finite Temperature/Density from QCD Sum Rules

    Koike Yuji

    Soryushiron Kenkyu   90 ( 2 )   B49   1994.11

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    Language:English   Publisher:Soryushiron Kenkyu  

    CiNii Article

    CiNii Books

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Presentations

  • 23pSD-10 Drell-Yan double-spin asymmetry A_<LT> in polarized pp^^^- collisions : Wandzura-Wilczek contribution

    Yoshida Shinsuke, Koike Yuji, Tanaka Kazuhiro

    Meeting abstracts of the Physical Society of Japan  2008.8  The Physical Society of Japan (JPS)

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    Event date: 2008.8

    Language:Japanese  

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  • Spin observables in twist-3 approach Invited International conference

    KOIKE Yuji

    22nd International Spin Symposium (SPIN2016), Univ. Illinois at Urbana-Champaign, IL, USA,  2016.9 

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  • Twist-3 spin asymmetries and parton correlations Invited International conference

    KOIKE Yuji

    26th International Nuclear Physics Conference (INPC2016), Adelaide, Australia  2016.9 

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  • Twist-3 asymmetries in proton-proton collisions Invited International conference

    KOIKE Yuji

    QCD Evolution 2016, Amsterdam, Netherland,  2016.5 

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  • `Twist-3 fragmentation effect in spin asymmetries Invited International conference

    KOIKE Yuji

    From 1D fragmentation towards 3D correlated fragmentation, ECT*, Trento, Italy  2015.10 

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  • Overview of the collinear twist-3 factorization for spin asymmetries Invited International conference

    KOIKE Yuji

    23rd International conference on deep-inelastic scattering and related subjects (DIS2015), Dallas, Texas, USA  2015.4 

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  • Single spin asymmetries in $pp$ collisions Invited International conference

    KOIKE Yuji

    KEK theory cernter workshop on hadron physics with high-momentum hadron beams at J-PARC in 2015, KEK, Tsukuba  2015.3 

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  • Single transverse spin asymmetry Invited International conference

    KOIKE Yuji

    4th Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and The Physical Society of Japan, (HAWAII 2014), October 7-11, 2014, Waikoloa, Hawaii  2014.10 

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  • The role of three-gluon correlation functions in the single-spin asymmetry Invited International conference

    KOIKE Yuji

    4th International Workshop on Transverse Plarization Phenomena in Hard Processes (Transversity 2014), Cagliari, Italy  2014.9 

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  • Single transverse spin asymmetry in QCD Invited International conference

    KOIKE Yuji

    9th Circum-Pan-Pacific Symposium on High Energy Spin Physics, Jinan, China  2013.10 

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  • Single transverse-spin asymmetry in twist-3 Invited International conference

    KOIKE Yuji

    Berkeley Summer Program, "QCD Landscape of the Nucleon and Atomic Nuclei", Lawrence Berkerey National Laboratory, California, USA  2013.8 

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  • Single transverse-spin asymmetry: New theory frameworks confront RHIC and eRHIC data Invited International conference

    KOIKE Yuji

    PHENIX Workshop on Physics Prospects With Detector and Accelerator Upgrades, 理研,和光市(埼玉)  2013.7 

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  • Single transverse-spin asymmetry in high-energy QCD Invited International conference

    KOIKE Yuji

    The 10th Particle Physics Phenomenology Workshop (PPP10)、 Chung-Yuan Christian University, Taiwan,  2013.5 

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  • Twist-3 single spin asymmetries Invited International conference

    Y. Koike

    3rd Workshop on the QCD Structure of the Nucleon (QCD-N'12), Bilbao, Spain  2012.10 

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  • Single Transverse Spin Asymmetry in the Forward and Backward Directions Invited International conference

    Y. Koike

    Workshop On Forward Physics at RHIC  2012.7  RIKEN-BNL Research Center

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    Venue:Brookhaven National Laboratory  

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  • Probing multi-parton correlations through single-spin asymmetries in QCD hard processes Invited International conference

    Y. Koike

    Modern Trends in Quantum Chromodynamics  2011.10  DESY

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    Venue:DESY, Zeuthen, Germany  

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  • Probing the multi-gluon correlations through single spin asymmetries Invited International conference

    Y. Koike

    Third International Workshop on Transverse Polarization Phenomena in Hard Scattering  2011.8  International Spin Physics Committee, Trieste unit of the PRIN 2008 project

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

    Venue:Veli Lošinj, Croatia  

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  • Probing multi-gluon correlations through single spin asymmetries in pp collisions Invited International conference

    Y. Koike

    8th Circum-Pan-Pacific Symposium on High Energy Spin Physics: PacSPIN2011, Cairns, Australia  2011.6 

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    Venue:Cairns, Australia  

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  • Probing multi-gluon correlations in pp collisions Invited International conference

    Y. Koike

    RIKEN-BNL center workshp ``Opportunities for Drell-Yan Physics at RHIC", BNL, Upton, NY, USA  2011.5 

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

    Venue:Brookhaven National Laboratory, Upton, New York, USA  

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  • Single transverse spin asymmetry in pp collisions: new results from twist-3 mechanism Invited International conference

    Y. Koike

    INT program``Gluons and the quark sea at high energies: distributions, polarization, tomography", (Univ. of Washington, Seattle, USA)  2010.11 

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

    Venue:Institute for Nuclear Theory, university of Washington, Seattle, USA  

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  • Overview of single transverse spin asymmetry: Twist-3 mechanism Invited International conference

    Y. Koike

    Brookhaven summer program on nucleon spin physics (Brookhaven National Laboratory, New York, USA)  2010.7 

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

    Venue:Brookhaven National Laboratory, Upton, New York, USA  

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  • Single transverse spin asymmetry in QCD Invited International conference

    Y. Koike

    `KEK theory center workshop on High-energy hadron physics with hadron beams  2010.1 

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    Venue:KEK  

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  • Theory of transverse spin and transverse structure of the nucleon Invited International conference

    Y. Koike

    第3回日米物理学会合同核物理分科会 (ハワイ島,Hilton Waikoloa)  2009.10 

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    Venue:ハワイ島,Hilton Waikoloa  

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  • Nucleon spin structure based on pQCD Invited International conference

    Y. Koike

    The 7-th Circum-Pan-Pacific Symposium for High-Energy Spin Physics, Yamagata  2009.9 

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    Venue:Yamagata  

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  • Single transverse spin asymmetry for SIDIS and pp\to\pi X Invited International conference

    Y. Koike

    Berkeley summer program on nucleon spin physics, Lawrence Berkeley National Laboratory, Berkely, California, USA  2009.6 

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    Venue:Lawrence Berkeley National Laboratory, Berkeley, California, USA  

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  • Single Transverse-Spin Asymmetry at eRHIC Invited International conference

    Y. Koike

    Workshop on Structure of Hadrons and Nuclei at an Electron Ion Collider (ECT*, Trento, Italy)  2008.7 

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    Venue:ECT*, Trento, Italy  

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  • Single Transverse-Spin Asymmetry in QCD Invited International conference

    Y. Koike

    PKU-RBRC Workshop on Transverse Spin Physics, (Peking Univ., Beijing, China)  2008.6 

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

    Venue:Beijing University, China  

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  • New Developments in the Twist-3 Formalism for Single-Transverse-Spin-Asymmetries: Factorization, Gauge invariance and Master formula for SGP mechanism Invited International conference

    Y. Koike

    The 6-th Circum-Pan-Pacific Symposium for High-Energy Spin Physics (Univ. of British Columbia, Vancouver, Canada)  2007.7 

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

    Venue:University of British Columbia, Vanvouver, Canada  

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  • Single Transverse Spin Asymmetry in QCD Invited International conference

    Y. Koike

    KEK symposium "Towards precision QCD physics" - dedicated to the memory of Jiro Kodaira -  2007.3  KEK

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

    Venue:KEK  

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  • Physics of Transverse Spin Invited International conference

    KOIKE Yuji

    第2回日米物理学会合同核物理分科会, (ハワイ,マウイ島,Ritz Carlton Hotel, Sep. 18 - Sep. 22, 2005) Workshop``Spin Structure Studies at RHIC"  2005.9 

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

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  • Single Transverse Spin Asymmetries Invited International conference

    KOIKE Yuji

    ``The 5-th Circum-Pan-Pacific Symposium for High-Energy Spin Physics", 東工大.  2005.7 

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  • Twist-3 Mechanism of Single Spin Asymmetries Invited International conference

    KOIKE Yuji

    RIKEN-BNL Research Center workshop "Single Spin Asymmetries", RIKEN-BNL Research Center, BNL, Upton, New York  2005.6 

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  • Topics in QCD Spin Physics Invited International conference

    KOIKE Yuji

    "Physics in LHC era", 京大基研.  2004.12 

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  • 'Azymuthal spin asymmetries for the large-$p_T$ hadron production at eRHIC Invited International conference

    KOIKE Yuji

    Second Electron-Ion Collider Workshop, Jefferson Lab., Newport News, Virginia, USA,  2004.3 

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  • "Single transverse spin Asymmetry in the pion production at RHIC and EIC Invited International conference

    KOIKE Yuji

    RIKEN-BNL center workshop ``High $p_T$ physics at RHIC'', RIKEN-BNL Research Center, BNL, New York, USA  2003.12 

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  • Azymuthal spin asymmetries for the large-$p_T$ hadron production at SIDIS Invited International conference

    KOIKE Yuji

    4-th Circum-Pan-Pacific Symposium on High Energy Spin Physics, University of Washington, Seattle, Washington, USA.  2003.8 

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  • `Single Transverse-Spin Asymmetries in $pp^\uparrow \to \pi X$ and $ep^\uparrow \to \pi X$ Invited International conference

    KOIKE Yuji

    日本ーイタリア共同シンポジウム ``Origin of Nucleon Spin'', 宮崎大学  2002.11 

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

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  • Single Spin Asymmetries and Soft Gluon-Poles Invited International conference

    KOIKE Yuji

    9th International Workshop on Deep Inelastic Scattering (DIS 2001), Bologna, Italy  2001.9 

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  • Evolution of transversity distribution Invited International conference

    KOIKE Yuji

    RIKEN-BNL center workshop ``Future Transversity Measurement'', RIKEN-BNL Research Center, BNL, New York, USA  2000.9 

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Research Projects

  • Quantitative understanding of mysterious phenomena caused by quark-gluon correlations in hadrons

    Grant number:24K07044

    2024.4 - 2027.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

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  • QCD高次ツイスト効果を起源とする謎現象の解明とハドロン構造の新側面の開拓

    Grant number:19K03843

    2019.4 - 2024.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    小池 裕司

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    Authorship:Principal investigator 

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    無偏極核子核子衝突から包含生成されるハイペロンの横偏極現象の起源を解明するため、摂動QCDのコリニアー因子化の枠組みで、この過程の微分断面積の表式を導出した。この枠組みでは、ハイペロンの偏極は核子中あるいはハイペロンの破砕過程におけるクォーク・グルーオンの多体相関を反映したツイスト3観測量として現れる。一般にツイスト3観測量に対する解析は、その困難さから結合定数について主要項を取り入れる近似(LO近似)で行われている。我々のこれまでの研究で、ツイスト3分布関数ならびにツイスト3クォーク破砕関数からの寄与はLO近似ですでに計算していたが、ハイペロンのツイスト3グルーオン破砕関数からの寄与が、完成されていなかった。今年度の研究により、この寄与の計算手法に関し完全な理解が得られ、LO近似の断面積を完成させた。ツイスト3グルーオン破砕関数の間に成立している、演算子恒等式に基づく関係(QCDの運動方程式関係式、ローレンツ不変性関係式)をもとに,断面積のゲージ不変性や座標系独立性について完全な理解が得られ、結果を査読雑誌に発表した。
    また、同様なハイペロン偏極現象は、レプトン核子衝突(SIDIS)におけるハイペロンの包含生成過程にも現れる。終状態にハイペロンの外にレプトンも捕獲するため、運動学はより複雑になるが、上述した核子核子衝突におけるハイペロン生成過程の研究で開発した定式化を、この過程に適用することにより、完全なツイスト3断面積を得た。結果は2編の論文として査読雑誌に公表した(1編は掲載済、1編は受理決定したところ)。
    これらの結果は、PANIC 2021, SPIN 2021というこの分野を代表する2つの国際会議にて、4つの口頭発表(院生3回と代表者1回)により報告した。

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  • クォーク・グルーオン多体相関がもたらす新奇現象の解明と構造関数の格子QCD計算

    2014.4 - 2019.3

    System name:科学研究費助成事業 基盤研究(B)

    Research category:基盤研究(B)

    Awarding organization:日本学術振興会

    小池裕司

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    Authorship:Principal investigator  Grant type:Competitive

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  • QCD高次ツイスト効果がもたらす新奇な現象の解明とハドロン構造の研究

    2011.4 - 2014.3

    System name:科学研究費助成事業 基盤研究(C)

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    小池裕司

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3500000 ( Direct Cost: \2450000 、 Indirect Cost:\1050000 )

    高エネルギーハドロン反応過程において謎であったシングルスピン非対称
    や,核物質中を通過する高エネルギーパートンのエネルギー損失などをQCDを基に明らかにする研究に取り組んでいる。

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  • 高エネルギー核子ー核子衝突におけるシングルスピン非対称の研究

    2008.7 - 2009.3

    System name:内田エネルギー財団・試験研究

    Awarding organization:民間財団等

    小池裕司

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\450000 ( Direct Cost: \450000 )

    高エネルギー核子核子衝突で観測されるシングルスピン非対称をQCDを
    基に解明する研究に取り組んだ。

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  • RHIC-SPINにおけるハドロンの内部構造の研究

    2000.4 - 2003.3

    System name:科学研究費助成事業 基盤研究(C)

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    小池裕司

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2900000 ( Direct Cost: \2900000 )

    米国ブルックヘブン国立研究所で行われているRHIC-SPIN実験等の
    高エネルギー衝突実験で測定される特徴的スピン観測量の量子色力学に基づいた解析と、それを通じて知ることができるハドロンのク
    ォーク・グルーオン構造に関する理論的研究をした。

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Teaching Experience (researchmap)

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Teaching Experience

  • 理学基礎演習

    2024
    Institution name:新潟大学

  • 量子研究の最前線

    2023
    Institution name:新潟大学

  • 日本事情自然系A

    2023
    Institution name:新潟大学

  • 量子色力学特論I

    2022
    Institution name:新潟大学

  • Advances in Physics and Chemistry

    2022
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2022
    Institution name:新潟大学

  • ハドロン物理学I

    2021
    Institution name:新潟大学

  • 原子核物理学

    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

  • 原子核物理学II

    2018
    Institution name:新潟大学

  • 量子力学序論B

    2017
    Institution name:新潟大学

  • 量子力学IIIB

    2017
    Institution name:新潟大学

  • 量子力学序論A

    2017
    Institution name:新潟大学

  • 量子力学IIIA

    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

  • 物理学への招待B

    2015
    -
    2016
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡB(物理学)

    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅱ(物理学)

    2015
    Institution name:新潟大学

  • 自然科学総論Ⅰ

    2015
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡA(物理学)

    2015
    Institution name:新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2014
    -
    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2014
    -
    2015
    Institution name:新潟大学

  • 課題探索特講

    2013
    Institution name:新潟大学

  • Introduction to Frontiers in Physics

    2013
    Institution name:新潟大学

  • 数理物質科学特定研究Ⅲ(物理学)

    2013
    Institution name:新潟大学

  • 研究発表演習・発表Ⅲ

    2013
    Institution name:新潟大学

  • 数理物質科学演習Ⅲ(物理学)

    2013
    Institution name:新潟大学

  • 原子核理論特論

    2012
    Institution name:新潟大学

  • コラボレーション演習

    2012
    Institution name:新潟大学

  • プロジェクト研究演習

    2012
    Institution name:新潟大学

  • 論文演習

    2012
    Institution name:新潟大学

  • 量子色力学特論Ⅰ

    2011
    -
    2020
    Institution name:新潟大学

  • 原子核物理特論Ⅱ

    2011
    Institution name:新潟大学

  • 物理学最前線入門

    2010
    Institution name:新潟大学

  • 物理学基礎BⅡ

    2008
    Institution name:新潟大学

  • ハドロン物理学Ⅰ

    2008
    -
    2019
    Institution name:新潟大学

  • 原子核物理学I

    2008
    -
    2017
    Institution name:新潟大学

  • 量子力学序論

    2008
    -
    2016
    Institution name:新潟大学

  • 量子色力学特論Ⅱ

    2008
    -
    2012
    Institution name:新潟大学

  • ハドロン物理学I

    2007
    -
    2021
    Institution name:新潟大学

  • 量子力学III

    2007
    -
    2016
    Institution name:新潟大学

  • 現代物理学への招待(物理学学習法)

    2007
    -
    2009
    Institution name:新潟大学

  • 量子色力学特論II

    2007
    Institution name:新潟大学

  • 物理数学II

    2007
    Institution name:新潟大学

  • 物理学基礎BII

    2007
    Institution name:新潟大学

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