Study of quark-gluon structure of hadrons with a large polarized target

• Project/Area Number: 18002006
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Mathematics and Physics
• Research Institution: Yamagata University
• Principal Investigator: IWATA Takahiro Yamagata University, 理学部, 教授 (70211761)
• Co-Investigator(Kenkyū-buntansha): YOSHIDA Hiroshi 山形大学, 基盤教育院, 准教授 (80241727) ; MATSUDA Tatsuro 宮崎大学, 工学部, 教授 (20253817) ; HORIKAWA Naoaki 中部大学, 工学部, 教授 (70022697) ; SUZUKI Hajime 中部大学, 工学部, 准教授 (20260044)
• Co-Investigator(Renkei-kenkyūsha): DOSHITA Norihiro 山形大学, 理学部, 助教 (90451658) ; KONDO Kaori 山形大学, 理学部, 助教 (80451657) ; ISHIMOTO Shigeru KEK, 素粒子原子核研究所, 講師 (50141974) ; HASEGAWA Takeo 宮崎大学, 工学部, 名誉教授 (70025386)
• Project Period (FY): 2006 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥177,320,000 (Direct Cost: ¥136,400,000、Indirect Cost: ¥40,920,000); Fiscal Year 2009: ¥22,490,000 (Direct Cost: ¥17,300,000、Indirect Cost: ¥5,190,000); Fiscal Year 2008: ¥28,470,000 (Direct Cost: ¥21,900,000、Indirect Cost: ¥6,570,000); Fiscal Year 2007: ¥68,900,000 (Direct Cost: ¥53,000,000、Indirect Cost: ¥15,900,000); Fiscal Year 2006: ¥57,460,000 (Direct Cost: ¥44,200,000、Indirect Cost: ¥13,260,000)
• Keywords: 核子 / スピン / クォーク / グルーオン / ハドロン / QCD / 偏極標的 / クォークスピン / グルーオンスピン / 核子スピン構造

Research Abstract

We have measured the gluon polarization in two reaction channels in order to investigate the origin of the nucleon spin. We obtained the polarization with the best precision ever in both channels. Contribution of the gluon spin to the nucleon spin is found to be not as large as the expectations by theories. We have obtained Collins and Sivers asymmetries which are related to the transverse spin state of quarks and their orbital motion. The results provided with rich information on details of quarks inside the nucleon.

Research Products

• [Journal Article] Gluon Polarisation in the Nucleon and Longitudinal Spin Asymmetries from Open Charm Muoproduction (2009)
  • Author(s): M. Alekseev, N. Doshita, T. Hasegawa, N. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, T. Michigami, other COMPASS Collaboration members.
  • Journal Title: Phys. Lett. B 676 Pages: 31-38
  • Peer Reviewed
• [Journal Article] Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS. (2009)
  • Author(s): M. Alekseev, N. Doshita, T. Hasegawa, N. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, T. Michigami, other COMPASS Collaboration members.
  • Journal Title: Eur. Phys. J. C 64 Pages: 171-179
  • Peer Reviewed
• [Journal Article] Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering (2009)
  • Author(s): M. Alekseev, N. Doshita, T. Hasegawa, N. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, T. Michigami, COMPASS Collaboration members
  • Journal Title: Phys. Lett. B 680 Pages: 217-224
  • Peer Reviewed
• [Journal Article] Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS (2009)
  • Author(s): M. Alekseev, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, other COMPASS Collaboration members
  • Journal Title: Phys. Lett. B 673 Pages: 127-135
  • Peer Reviewed
• [Journal Article] Gluon Polarisation in the Nucleon and Longitudinal Spin Asymmetries from Open Charm Muoproduction (2009)
  • Author(s): COMPASS Collaboratio, M.Alekseev, et al.
  • Journal Title: Phys.Lett. B676 Pages: 31-38
  • Peer Reviewed
• [Journal Article] Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS (2009)
  • Author(s): COMPASS Collaboration, M.Alekseev, et al.
  • Journal Title: Eur.Phys.J. C64 Pages: 171-179
  • Peer Reviewed
• [Journal Article] Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering (2009)
  • Author(s): COMPASS Collaboration, M.Alekseev, et al.
  • Journal Title: Phys.Lett. B680 Pages: 217-224
  • Peer Reviewed
• [Journal Article] Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS (2009)
  • Author(s): COMPASS Collaboration, M.Alekseev, et al.
  • Journal Title: Phys.Lett. B673 Pages: 127-135
  • Peer Reviewed
• [Journal Article] Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS (2009)
  • Author(s): COMPASS Collaboration(M.Alekseev et.al.)
  • Journal Title: Phys. Lett B Pages: 127-135
  • Peer Reviewed
• [Journal Article] The Polarised Valence Quark Distribution from semi-inclusive DIS. (2008)
  • Author(s): M. Alekseev, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, other COMPASS Collaboration members
  • Journal Title: Phys. Lett. B 660 Pages: 458-465
  • Peer Reviewed
• [Journal Article] The Polarized Valence Quark Distribution from semi-inclusive DIS (2008)
  • Author(s): COMPASS Collaboration(M.Alekseev et.al.)
  • Journal Title: Phys. Lett. 3660 Pages: 458-465
  • Peer Reviewed
• [Journal Article] The COMPASS polarized target in 2006 and 2007 (2008)
  • Author(s): COMPASS Collaboration(N.Doshita et.al.)
  • Journal Title: Conf. Proc 980 Pages: 307-311
  • Peer Reviewed
• [Journal Article] The Polarised Valence Quark Distribution from semi-inclusive DIS. (2008)
  • Author(s): M., Alekseev, et. al.
  • Journal Title: Phys.Lett. B660 Pages: 458-465
  • Peer Reviewed
• [Journal Article] Double spin asymmetry in exclusiveρ0 muoproduction at COMPASS (2007)
  • Author(s): M. Alekseev, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, N. Takabayashi, other COMPASS Collaboration members
  • Journal Title: Eur. Phys. J. C Pages: 255-265
  • Peer Reviewed
• [Journal Article] Spin asymmetry A1(d) and the spin-dependent structure function g1(d) of the deuteron at low values of x and Q**2 (2007)
  • Author(s): V. Yu. Alexakhin, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, N. Takabayashi, other COMPASS Collaboration members
  • Journal Title: Phys. Lett. B 647 Pages: 330-340
  • Peer Reviewed
• [Journal Article] The COMPASS experiment at CERN (2007)
  • Author(s): P. Abbon, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, N. Takabayashi, T. Toeda, other COMPASS Collaboration members
  • Journal Title: Nucl. Instrum. Meth. A 577 Pages: 455-518
  • Peer Reviewed
• [Journal Article] A New measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target. (2007)
  • Author(s): E.S. Ageev, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, T. Toeda, other COMPASS Collaboration members
  • Journal Title: Nucl. Phys. B 765 Pages: 31-70
  • Peer Reviewed
• [Journal Article] The Deuteron Spin-dependent Structure Function g1(d) and its First Moment. (2007)
  • Author(s): V. Yu. Alexakhin, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, T. Iwata, K. Kondo, T. Matsuda, other COMPASS Collaboration members
  • Journal Title: Phys. Lett. B 647 Pages: 8-17
  • Peer Reviewed
• [Journal Article] Spin asymmetry Al(d)and the spin-dependent structure function gl(d) of the deuteron at low valus of x and Q**2. (2007)
  • Author(s): E.S., Ageev, et. al.
  • Journal Title: Phys.Lett. B647 Pages: 330-340
  • Peer Reviewed
• [Journal Article] The Deuteron Spin-dependent Structure Function gl(d) and its First Moment. (2007)
  • Author(s): V.Yu., Alexakhin, et. al.
  • Journal Title: Phys.Lett. B647 Pages: 8-17
  • Peer Reviewed
• [Journal Article] A New measurement of the Collins and Sivers asymmetries on a transversely polarized deuteron target (2007)
  • Author(s): E. S. Ageev T. Iwata, T. Matsuda N. Horikawa and COMPASS collaboration
  • Journal Title: Nuclear Physics B765 Pages: 31-70
• [Journal Article] Gluon polarization in the nucleon from quasi-real photoproduction of high-p(T) hadron pairs. (2006)
  • Author(s): E.S. Ageev, N. Doshita, T. Hasegawa, N. Horikawa, S. Horikawa, S. Ishimoto, T. Iwata, K. Kondo, T. Matsuda, N. Takabayashi, T. Toeda, other COMPASS Collaboration members.
  • Journal Title: Phys. Lett. B 633 Pages: 25-32
  • Peer Reviewed
• [Journal Article] Gluonymmetries polarization in the nucleon from quasipreal photoproduction of high-PT hadron pairs (2006)
  • Author(s): E. S. Ageev T. Iwata, T. Matsuda N. Horikawa and COMPASS collaboration
  • Journal Title: Physics. Letters B633 Pages: 25-32
• [Presentation] COMPASS偏極標的マイクロ波系のための高出力対応Eバンド可変減衰器の開発 (2010)
  • Author(s): 松田洋樹
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-23
• [Presentation] 2010/2011ランのためのCOMPASS偏極標的のアップグレード (2010)
  • Author(s): 近藤薫
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-23
• [Presentation] COMPASSでの偏極ドレル・ヤン測定のためのビームテストの結果 (2010)
  • Author(s): 堂下典弘
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-23
• [Presentation] Hadron spectroscopy at COMPASS - exotic states at COMPASS (2010)
  • Author(s): Takahiro Iwata
  • Organizer: New Frontiers in QCD - Kyoto, Japan
  • Place of Presentation: (invited)
• [Presentation] Future Drell-Yan program of the COMPASS collaboration (2010)
  • Author(s): Norihiro Doshita
  • Organizer: KEK理論センター研究会「High-energy hadron physics with hadron beams」
  • Place of Presentation: ke k, つくば市
• [Presentation] Future Drell-Yan program of the COMPASS collaboration (2010)
  • Author(s): 堂下典弘
  • Organizer: KEK理論センター研究会「High-energy hadron physics with hadron beams)
  • Place of Presentation: KEK, つくば市
• [Presentation] Hadron spectroscopy at COMPASS -exotic states at COMPASS (2010)
  • Author(s): Takahiro Iwata
  • Organizer: New Frontiers in QCD
  • Place of Presentation: Kyoto, Japan
• [Presentation] STUDY OF SPIN STRUCTURE OF NUCLEON AT COMPASS AND ETS CHALLENGES (2009)
  • Author(s): T.Iwata
  • Organizer: KEK Workshop on Nucleon Structure
  • Place of Presentation: KEK, つくば市(口頭発表)
  • Year and Date: 2009-01-10
• [Presentation] Measurements of the Gluon Polarization in the Nucleon at COMPASS (2009)
  • Author(s): Takahiro Iwata
  • Organizer: The 3rd Joint Meeting of the Nuclear Physics Division of the APS and JPS
  • Place of Presentation: Hilton Waikoloa Village, Hawaii
• [Presentation] Quark helicity distributions from DIS and SIDIS at COMPASS (2009)
  • Author(s): Tatsuro Matsuda
  • Organizer: he 3rd Joint Meeting of the Nuclear Physics Division of the APS and JPS
  • Place of Presentation: Hilton Waikoloa Village, Hawaii
• [Presentation] Tranaverstiy results and polarized Drell-Yan measurement at COMPASS (2009)
  • Author(s): Norihiro Doshita
  • Organizer: The 3rd Joint Meeting of the Nuclear Physics Division of the APS and JPS
  • Place of Presentation: Hilton Waikoloa Village, Hawaii
• [Presentation] Polarized Drell-Yan measurement at COMPASS (2009)
  • Author(s): Norihiro Doshita
  • Organizer: 第7回環太平洋高エネルギースピン物理学国際会議
  • Place of Presentation: 遊学館、山形市
• [Presentation] Measurements of the Gluon Polarization in the Nucleon at COMPASS (2009)
  • Author(s): Takahiro Iwata
  • Organizer: The 3^<rd> Joint Meeting of the Nuclear Physics Division of the APS and JPS Hilton Waikoloa Village, Hawaii
  • Place of Presentation: Hilton Waikoloa Village, Hawaii, USA
• [Presentation] Quark helicity distributions from DIS and SIDIS at COMPASS (2009)
  • Author(s): 松田洋樹
  • Organizer: The 3^<rd> Joint Meeting of the Nuclear Physics Division of the APS and JPS Hilton Waikoloa Village, Hawaii
  • Place of Presentation: Hilton Waikoloa Village, Hawaii, USA
• [Presentation] Tranaverstiy results and polarized Drell-Yan measurement at COMPASS (2009)
  • Author(s): 堂下典弘
  • Organizer: The 3^<rd> Joint Meeting of the Nuclear Physics Division of the APS and JPS Hilton Waikoloa Village, Hawaii
  • Place of Presentation: Hilton Waikoloa Village, Hawaii, USA
• [Presentation] COMPASS実験におけるアンモニア標的の核偏極度解析 (2008)
  • Author(s): 道上琢磨
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 山形大学、山形市(口頭発表)
  • Year and Date: 2008-09-23
• [Presentation] COMPASS偏極標的2002-2007 (2008)
  • Author(s): 近藤薫
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 山形大学、山形市(口頭発表)
  • Year and Date: 2008-09-23
• [Presentation] 横偏極を用いたCOMPASSの最近の結果 (2008)
  • Author(s): 松田達郎
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 山形大学、山形市(口頭発表)
  • Year and Date: 2008-09-23
• [Presentation] COMPASS Drell-Yan Program (2008)
  • Author(s): Takahiro Iwata
  • Organizer: 59th RIBF Nuclear Physics Seminar
  • Place of Presentation: 理化学研究所、和光市
  • Year and Date: 2008-04-08
• [Presentation] Polarized Target for COMPASS Drell-Yan program (2008)
  • Author(s): Norihiro Doshita
  • Organizer: 国際シンポジュム「偏極標的とその応用」
  • Place of Presentation: 月岡ホテル, 上山市
• [Presentation] Past and future of the COMPASS polarized target (2008)
  • Author(s): Norihiro Doshita
  • Organizer: Symmetries and Spin ( Spin-Praha-2008 )
  • Place of Presentation: Charles University, Prague
• [Presentation] Past and Future of the COMPASS Polarized Target (2008)
  • Author(s): N. Dosllita
  • Organizer: ADVANCED STUDIES INSTITUTE, "SYMMETRIES AND SPIN"
  • Place of Presentation: Czech. Republic, Prague(口頭発表)
• [Presentation] Polarized target for the COMPASS Drell-Yan program. (2008)
  • Author(s): N, Doshita
  • Organizer: International symposium on polarized target and its applications.
  • Place of Presentation: Kaminoyama,Japan.
• [Presentation] Results for Transverse Spin Physics at COMPASS (2007)
  • Author(s): Takahiro Iwata
  • Organizer: The 6th Circum-Pan-Pacific Symposium on High Energy Spin Physics
  • Place of Presentation: University of British Columbia, Canada
• [Presentation] Measurement of the Gluon Polarization at COMPASS (2007)
  • Author(s): Norihiro Doshita
  • Organizer: The 6th Circum-Pan-Pacific Symposium on High Energy Spin Physics
  • Place of Presentation: University of British Columbia, Canada
• [Presentation] COMPASS Target (2007)
  • Author(s): Norihiro Doshita
  • Organizer: International Workshop on Polarized Sources, Target & Polarimetry
  • Place of Presentation: Brookhaven National Laboratory, New York
• [Presentation] Measurement of the Gluon Polarization at COMPASS. (2007)
  • Author(s): N, Doshita
  • Organizer: The 6th Circum-Pan-Pacific Symposium on High Energy Spin Physics.
  • Place of Presentation: Vancouver BC,Canada
• [Presentation] Results for Transverse Spin Physics at COMPASS. (2007)
  • Author(s): T, Iwata
  • Organizer: The 6th Circum-Pan-Pacific Symposium on High Energy Spin Physics.
  • Place of Presentation: Vancouver BC,Canada
• [Presentation] Gluon polarization measurements in DIS experiments. (2007)
  • Author(s): T, Iwata
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学,札幌
• [Presentation] The COMPASS polarized target in 2006 and 2007. (2007)
  • Author(s): N, Doshita
  • Organizer: XIIth International Workshop on Polarized Sources, Targets & Polarimetry
  • Place of Presentation: Upton,New York USA11937-5000U.S.A
• [Presentation] Upgrade of the polarized target and the spectrometer of COMPASS (2006)
  • Author(s): Takahiro Iwata
  • Organizer: Joint Meeting of The PAC Region Particle Physics Communities
  • Place of Presentation: Sheraton Waikiki Hotel, Hawaii
• [Presentation] Measurement of Delta_G/G to study gluon spin contribution (2006)
  • Author(s): Kaori Kondo
  • Organizer: Joint Meeting of The PAC Region Particle Physics Communities
  • Place of Presentation: Sheraton Waikiki Hotel, Hawaii
• [Presentation] Heat input into the target material (2006)
  • Author(s): Norihiro Doshita
  • Organizer: 3rd Meeting Polarized Nucleon Targets for Europe, in the 6th European Framework Program
  • Place of Presentation: Rech, Germany