Charge-symmetry breaking of parton distribution functions and flavor-asymmetry of sea-quark distributions

• Project/Area Number: 21540268
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: WAKAMATSU Masashi 大阪大学, 大学院・理学研究科, 准教授 (40135653)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 核子の内部構造 / カイラル対称性 / 海クォーク分布 / 荷電非対称性 / 深部非弾性散乱 / NuTeVアノマリー / ストレンジ・クォーク分布 / 荷電対称性 / 反クォーク分布 / 核子スピン分解 / ゲージ不変性 / 観測可能性

Research Abstract

We investigated the effects of charge-symmetry breaking and flavor-symmetry breaking on the quark and antiquark distribution functions in a unified manner within the framework of the chiral quark soliton model. Different from the past analysis based on a naive model, we find that the effect of strange and anti-strange quark asymmetry is more than a factor of 5 larger than the charge-symmetry breaking effects.

Research Products

• [Journal Article] Recent work on angular momentum (2011)
  • Author(s): M. Wakamatsu
  • Journal Title: IL Nuovo Cimento Volume: 35C Pages: 247-254
• [Journal Article] Orbital angular momentum of quarks and gluons in the nucleon-model-dependent and model-independent extraction- (2011)
  • Author(s): M. Wakamatsu
  • Journal Title: AIP Conference Proceedings Volume: 1418 Pages: 39-46
• [Journal Article] Gauge-independence of gluon spin in the nucleon and its evolution (2011)
  • Author(s): M. Wakamatsu
  • Journal Title: Phys. Rev Volume: D84
  • Peer Reviewed
• [Journal Article] Gauge-invariant decomposition of nucleon spin (2011)
  • Author(s): M. Wakamatsu
  • Journal Title: J. Phys.: Conf. Ser Volume: 295
• [Journal Article] Gauge-and frame-independent decomposition of nucleon spin (2011)
  • Author(s): 若松正志
  • Journal Title: Physical Review Volume: D83 Issue: 1
  • DOI: 10.1103/physrevd.83.014012
  • Peer Reviewed
• [Journal Article] Gauge-independence of gluon spin in the nucleon and its evolution (2011)
  • Author(s): 若松正志
  • Journal Title: Physical Review Volume: D84 Issue: 3
  • DOI: 10.1103/physrevd.84.037501
  • Peer Reviewed
• [Journal Article] Gauge-invariant decomposition of nucleon spin (2011)
  • Author(s): 若松正志
  • Journal Title: J.Phys. : Conf.Ser. Volume: 295 Pages: 012038-012038
  • DOI: 10.1088/1742-6596/295/1/012038
• [Journal Article] Gauge-invariant decomposition of nucleon spin (2011)
  • Author(s): 若松正志
  • Journal Title: AIP Conference Proceedings Volume: 1418 Pages: 39-46
  • DOI: 10.1063/1.3667301
• [Journal Article] Gauge- and frame-independent decomposition of nucleon spin (2011)
  • Author(s): 若松正志
  • Journal Title: Physical Review D Volume: D83
  • Peer Reviewed
• [Journal Article] Gauge-invariant decomposition of nucleon spin (2011)
  • Author(s): 若松正志
  • Journal Title: In proceedings of "The 19th International Spin Physics Symposium", Journal of Physics Volume: (印刷中 未定)
• [Journal Article] Gauge-and frame-independent decomposition of nucleon spin (2010)
  • Author(s): M. Wakamatsu
  • Journal Title: Phys. Rev Volume: D83
  • Peer Reviewed
• [Journal Article] Reply to the comment by A. W. Thomas et al. on" The role of the orbital angular momentum in the proton spin" (2010)
  • Author(s): M. Wakamatsu
  • Journal Title: European Physics Journal A Volume: A46 Pages: 327-328
  • Peer Reviewed
• [Journal Article] Gauge-invariant decomposition of nucleon spin (2010)
  • Author(s): M. Wakamatsu
  • Journal Title: Phys. Rev Volume: D81
  • Peer Reviewed
• [Journal Article] The role of orbital angular momentum in the proton (2010)
  • Author(s): M. Wakamatsu
  • Journal Title: European Physics Journal A Volume: A44 Pages: 297-303
  • Peer Reviewed
• [Journal Article] The role of orbital angular momentum in the proton spin (2010)
  • Author(s): 若松正志
  • Journal Title: European Physics Journal A Volume: A44 Pages: 297-303
  • Peer Reviewed
• [Journal Article] Gauge-invariant decomposition of nucleon spin (2010)
  • Author(s): 若松正志
  • Journal Title: Physical Review D Volume: D81
  • Peer Reviewed
• [Journal Article] Reply to the comment by A.W.Thomas et al.on "The role of the orbital angular momentum in the proton spin" (2010)
  • Author(s): 若松正志
  • Journal Title: European Physics Journal A Volume: A46 Pages: 327-328
  • Peer Reviewed
• [Journal Article] The role of orbital angular momentum in the proton (2010)
  • Author(s): M.Wakamatsu
  • Journal Title: Eur.Physical Journal A (in press)
  • Peer Reviewed
• [Journal Article] Chiral quark soliton model and nucleon spin structure functions (2009)
  • Author(s): M. Wakamatsu
  • Journal Title: Bled Workshop in Physics, Univ. of Ljubljana and Jozef Stefan Institute Volume: 10 Pages: 62-70
• [Journal Article] Transverse momentum distributions of quarks in the nucleon from the chiral quark soliton model (2009)
  • Author(s): M. Wakamatsu
  • Journal Title: Phys. Rev Volume: D79
  • Peer Reviewed
• [Journal Article] Chiral-odd generalized parton distributions, transversity decomposition of angular momentum, and tensor charge of the nucleon (2009)
  • Author(s): M. Wakamatsu
  • Journal Title: Phys. Rev Volume: D79
  • Peer Reviewed
• [Journal Article] Chiral-odd generalized parton distributions, transversity decomposition of angular momentum, and tensor charge of the nucleon (2009)
  • Author(s): M.Wakamatsu
  • Journal Title: Physical Review D79
  • Peer Reviewed
• [Journal Article] Transverse momentum distributions of quarks in the nucleon from the chiral quark soliton model (2009)
  • Author(s): M.Wakamatsu
  • Journal Title: Physical Review D79
  • Peer Reviewed
• [Journal Article] Chiral quark soliton model and nucleon spin structure functions (2009)
  • Author(s): M.Wakamatsu
  • Journal Title: Bled Workshop in Physics, Univ.of Ljubljana and Jozef Stefan Institute 10 Pages: 62-70
• [Presentation] Is a complete decomposition of nucleon spin possible (2012)
  • Author(s): M. Wakamatsu
  • Organizer: International workshop on hadron structure and spectroscopy
  • Place of Presentation: Lisbon, Portugal
  • Year and Date: 2012-04-16
• [Presentation] Toward a complete decomposition of nucleon spin (2012)
  • Author(s): M. Wakamatsu
  • Organizer: INT Workshop INT-12-49W : Angular momentum in QCD
  • Place of Presentation: Univ. of Washington, Seattle, USA
  • Year and Date: 2012-02-08
• [Presentation] Towarda complete decomposition of nucleon spin (2012)
  • Author(s): 若松正志
  • Organizer: INT Workshop INT-12-49W : Angular momentum in QCD
  • Place of Presentation: Institute for Nuclear Theory, Univ.of ashington, Seattle, USA(招待講演)
  • Year and Date: 2012-02-08
• [Presentation] Recent work on orbital angular momentum (2011)
  • Author(s): M. Wakamatsu
  • Organizer: Transversity 2011. Third International Workshop on Transverse Polarization Phenomena in Hard Scattering
  • Place of Presentation: Veli Losinj, Croatia
  • Year and Date: 2011-09-01
• [Presentation] Recent work on orbital angular momentum (2011)
  • Author(s): 若松正志
  • Organizer: Transversity 2011-Third International Workshopon Transverse Polarization Phenomena in Hard Scattering
  • Place of Presentation: Veil Losinj, Croatia(招待講演)
  • Year and Date: 2011-09-01
• [Presentation] Orbital angular momenta of quarks and gluons-Model-dependent and model-independent extraction- (2011)
  • Author(s): M. Wakamatsu
  • Organizer: The 7^<th> Circum-Pan-Pacifuc Symposium on High Energy Physics
  • Place of Presentation: Cairns, Australia
  • Year and Date: 2011-06-20
• [Presentation] Orbital angular momenta ot quarks and gluons-Model-dependent and model-independent extraction (2011)
  • Author(s): 若松正志
  • Organizer: 7th Circum-Pan-Pacific Symposium on High Energy Spin Physics
  • Place of Presentation: Cairns, Australia(招待講演)
  • Year and Date: 2011-06-20
• [Presentation] Generalized parton distributions and transverse-momentum dependent distributions (2011)
  • Author(s): M. Wakamatsu
  • Organizer: New development of nucleon structure functions
  • Place of Presentation: KEK, Tsukuba, Japan
  • Year and Date: 2011-01-08
• [Presentation] Generalized parton distributions and transverse-momentum dependent distributions (2011)
  • Author(s): 若松正志
  • Organizer: New development of nucleon structure function studies
  • Place of Presentation: 高エネルギー加速器研究機構(茨城)(招待講演)
  • Year and Date: 2011-01-08
• [Presentation] QCD Theory and Models (2011)
  • Author(s): M. Wakamatsu
  • Organizer: PHENIX Spinfest 2011
  • Place of Presentation: Riken, Wako, Japan
• [Presentation] QCD Theory and Models (2011)
  • Author(s): 若松正志
  • Organizer: PHENIX Spinfest 2011
  • Place of Presentation: Riken, Wako, Japan(招待講演)
• [Presentation] Gauge-invariant decomposition of nucleon spin (2010)
  • Author(s): M. Wakamatsu
  • Organizer: The 19^<th> Intenational Spin Physics Symposium
  • Place of Presentation: Forschungszentrum、Juelich, Germany
  • Year and Date: 2010-09-27
• [Presentation] Gauge-invariant decomposition of nucleon spin (2010)
  • Author(s): 若松正志
  • Organizer: The 19th International Spin Physics Symposium
  • Place of Presentation: Forschungszentrum, Juelich, Germany
  • Year and Date: 2010-09-27
• [Presentation] Gauge-and frame-independent decomposition of nucleon spin (2010)
  • Author(s): M. Wakamatsu
  • Organizer: High Energy Strong Interaction 2010-Parton Distributions and Dense QCD Matter
  • Place of Presentation: Yukawa Institute、Kyoto, Japan
  • Year and Date: 2010-08-27
• [Presentation] Gauge-and frame-independent decomposition of nucleon spin (2010)
  • Author(s): 若松正志
  • Organizer: High Energy Strong Interactions 2010-Parton Distributions and Dense QCD Matter
  • Place of Presentation: Yukawa Institute, Kyoto, Japan(招待講演)
  • Year and Date: 2010-08-27
• [Presentation] Gauge-and frame-independent decomposition of nucleon spin (2010)
  • Author(s): M. Wakamatsu
  • Organizer: Brookhaven Summer Program on Nucleon Spin Physics
  • Place of Presentation: BNL、NewYork、USA
  • Year and Date: 2010-07-23
• [Presentation] Gauge-and frame-independent decomposition of nucleon spin (2010)
  • Author(s): 若松正志
  • Organizer: Boorkhaven Summer Program on Nucleon Spin Physics
  • Place of Presentation: Brookhaven National Lab., Upton, New York, USA(招待講演)
  • Year and Date: 2010-07-23
• [Presentation] The role of orbital angular momentum in the proton spin (2010)
  • Author(s): M. Wakamatsu
  • Organizer: KEK theory center workshop on high-energy hadron physics with hadron beams
  • Place of Presentation: KEK, Tsukuba, Japan
  • Year and Date: 2010-06-08
• [Presentation] Nucleon spin structure, theoretical basis of orbital-angular-momentum measurement (2010)
  • Author(s): M. Wakamatsu
  • Organizer: relation with GPD and TMD distributions, Riken Workshop on nucleon structures and orbital angular momentum
  • Place of Presentation: RIKEN, Wako, Japan
  • Year and Date: 2010-02-12
• [Presentation] Nucleon spin structure, theoretical basis of orbital-angular-momentum measurement, relation with GPD and TMD distributions (2010)
  • Author(s): M.Wakamatsu
  • Organizer: RIKEN workshop on nucleon structure and orbital angular momentum
  • Place of Presentation: RIKEN, Wako, Japan (埼玉)
  • Year and Date: 2010-02-12
• [Presentation] The role of orbital angular momentum in the proton spin (2010)
  • Author(s): M.Wakamatsu
  • Organizer: KEK theory center workshop on high-energy hadron physics with hadron beams
  • Place of Presentation: KEK, Tsukuba, Japan (茨城)
• [Presentation] Nucleon spin structure from chiral quark soliton model (2009)
  • Author(s): M. Wakamatsu
  • Organizer: The 6-th Circum-Pan-Pacific Symposium on High Energy Spin Physics, 2009. 9. 17
  • Place of Presentation: Yamagata, Japan
  • Year and Date: 2009-09-17
• [Presentation] The chiral quark soliton model and nucleon spin structure functions (2009)
  • Author(s): M. Wakamatsu
  • Organizer: Mini Workshop Bled : Problems in Multiquark States
  • Place of Presentation: Bled, Slovenia
  • Year and Date: 2009-07-01
• [Presentation] Nucleon spin structure from chiral quark soliton model (2009)
  • Author(s): M.Wakamatsu
  • Organizer: The 6^<th> Circum-Pan-Pacific Symposium on High Energy Spin Physics
  • Place of Presentation: Yamagata, Japan
• [Book] Handbook of Solitons : Research and Technology (2009)
  • Author(s): M. Wakamatsu、and many others
  • Publisher: Nova Science Publishers、USA
• [Book] Handbook of Solitons : Research and Technology (2009)
  • Author(s): M.Wakamatsu, many others
  • Total Pages: 854
  • Publisher: Nova Science Publishers, USA