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2014 Fiscal Year Annual Research Report

人類未到エネルギーにおける粒子生成機構と非束縛クォーク間相互作用解明への王道敷設

Research Project

Project/Area Number 23340074
Research InstitutionHiroshima University

Principal Investigator

志垣 賢太  広島大学, 理学(系)研究科(研究院), 准教授 (70354743)

Co-Investigator(Kenkyū-buntansha) 杉立 徹  広島大学, 理学(系)研究科(研究院), 教授 (80144806)
Project Period (FY) 2011-04-01 – 2015-03-31
Keywordsパートン多体系 / 高エネルギー原子核衝突 / 粒子生成機構 / クォーク間相互作用 / 宇宙創成
Outline of Annual Research Achievements

我々は RHIC-PHENIX 実験においてパートン非束縛相の生成を明らかにし、パートン多体系の性質の根幹を成す非束縛クォークの挙動解明への舞台を整えた。平成 22 年に本格稼働を開始した世界最高エネルギーの加速器 LHC を用い、この実験クォーク物理学の本来課題の決着に挑む。
RHIC 加速器において同相生成の最初の証左となった高横運動量ハドロンに着目し、LHC 加速器において鍵となる重クォークとのリンクにより、高温非束縛クォーク間の相互作用を解明する。第一に陽子相互衝突における生成中間子スケーリング則(またはその破れ)から人類未到エネルギーでの粒子生成機構の解明と理解、第二に原子核相互衝突における変位測定による非束縛クォーク挙動の解明、の 2 点を柱に、LHC-ALICE 実験当初数年間の最も本質的な物理成果を目指す。
平成 26 年度は、LHC 加速器の設計エネルギー運転に向けた加速器改良整備のための運転停止期間を利用し、平成 24 年度に収集した重心系エネルギー 8 TeV の陽子相互衝突および比較対照実験として重要な陽子原子核衝突を用いて、ALICE 実験において中性中間子の光子崩壊過程解析を推進し、原子核相互衝突における変位測定に堅固なベースラインを与えた。また、平成 23 年度に収集済の原子核相互衝突事象の高粒子多重度に対応した解析手法の細部までを確立した。

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

  • Research Products

    (47 results)

All 2015 2014

All Journal Article (42 results) (of which Peer Reviewed: 42 results) Presentation (5 results) (of which Invited: 3 results)

  • [Journal Article] Two-pion femtoscopy in p-Pb collisions at sqrt(sNN) = 5.02 TeV2015

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 91 Pages: 034906

    • DOI

      10.1103/PhysRevC.91.034906

    • Peer Reviewed
  • [Journal Article] Production of inclusive Upsilon(1S) and Upsilon(2S) in p-Pb collisions at sqrt(sNN) = 5.02 TeV2015

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B740 Pages: 105-117

    • DOI

      10.1016/j.physletb.2014.11.041

    • Peer Reviewed
  • [Journal Article] Charged-pion cross sections and double-helicity asymmetries in polarized p+p collisions at sqrt(s) = 200 GeV2015

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 91 Pages: 032001

    • DOI

      10.1103/PhysRevD.91.032001

    • Peer Reviewed
  • [Journal Article] Search for dark photons from neutral meson decays in p+p and d+Au collisions at sqrt(sNN) = 200 GeV2015

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 91 Pages: 031901

    • DOI

      10.1103/PhysRevC.91.031901

    • Peer Reviewed
  • [Journal Article] Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at sqrt(sNN) = 5.02 TeV2015

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B741 Pages: 38-50

    • DOI

      10.1016/j.physletb.2014.11.028

    • Peer Reviewed
  • [Journal Article] Production of Sigma(1385)pm and Xi(1530)0 in proton-proton collisions at sqrt(s) = 7 TeV2015

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Eur. Phys. J.

      Volume: 75 Pages: 1

    • DOI

      10.1140/epjc/s10052-014-3191-x

    • Peer Reviewed
  • [Journal Article] Measurement of electrons from semileptonic heavy-flavor hadron decays in pp collisions at sqrt(s) = 2.76 TeV2015

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 91 Pages: 012001

    • DOI

      10.1103/PhysRevD.91.012001

    • Peer Reviewed
  • [Journal Article] Cross section for bbbar production via dielectrons in d+Au collisions at sqrt(sNN) = 200 GeV2015

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 91 Pages: 014907

    • DOI

      10.1103/PhysRevC.91.014907

    • Peer Reviewed
  • [Journal Article] Measurement of Upsilon(1S+2S+3S) production in p+p and Au+Au collisions at sqrt(sNN) = 200 GeV2015

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 91 Pages: 024913

    • DOI

      10.1103/PhysRevC.91.024913

    • Peer Reviewed
  • [Journal Article] K*(892)0 and phi(1020) production in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV2015

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 91 Pages: 024609

    • DOI

      10.1103/PhysRevC.91.024609

    • Peer Reviewed
  • [Journal Article] Event-by-event mean pT fluctuations in pp and Pb-Pb collisions at the LHC2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Eur. Phys. J.

      Volume: C74 Pages: 3077

    • DOI

      10.1140/epjc/s10052-014-3077-y

    • Peer Reviewed
  • [Journal Article] Exclusive J/Psi photoproduction off protons in ultra-peripheral p-Pb collisions at sqrt(sNN) = 5.02 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Pages: 232504

    • DOI

      10.1103/PhysRevLett.113.232504

    • Peer Reviewed
  • [Journal Article] Cross section and transverse single-spin asymmetry of eta mesons in p+p collisions at sqrt(s) = 200 GeV at forward rapidity2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 90 Pages: 072008

    • DOI

      10.1103/PhysRevD.90.072008

    • Peer Reviewed
  • [Journal Article] Multiparticle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 90 Pages: 054901

    • DOI

      10.1103/PhysRevC.90.054901

    • Peer Reviewed
  • [Journal Article] Suppression of Upsilon(1S) at forward rapidity in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B738 Pages: 361-372

    • DOI

      10.1016/j.physletb.2014.10.001

    • Peer Reviewed
  • [Journal Article] Beauty production in pp collisions at sqrt(s) = 2.76 TeV measured via semi-electronic decays2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B738 Pages: 97-108

    • DOI

      10.1016/j.physletb.2014.09.026

    • Peer Reviewed
  • [Journal Article] Low-mass vector-meson production at forward rapidity in p+p collisions at sqrt(s) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 90 Pages: 052002

    • DOI

      10.1103/PhysRevD.90.052002

    • Peer Reviewed
  • [Journal Article] Suppression of Psi(2S) production in p-Pb collisions at sqrt(sNN) = 5.02 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      JHEP

      Volume: 1412 Pages: 073

    • DOI

      10.1007/JHEP12(2014)073

    • Peer Reviewed
  • [Journal Article] Neutral pion production at midrapidity in pp and Pb-Pb collisions at sqrt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Eur. Phys. J.

      Volume: C74 Pages: 3108

    • DOI

      10.1140/epjc/s10052-014-3108-8

    • Peer Reviewed
  • [Journal Article] Measurement of K0s and K*0 in p+p, d+Au, and Cu+Cu collisions at sqrt(sNN) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 90 Pages: 054905

    • DOI

      10.1103/PhysRevC.90.054905

    • Peer Reviewed
  • [Journal Article] Measurement of prompt D-meson production in p-Pb collisions at sqrt(NN) = 5.02 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Pages: 232301

    • DOI

      10.1103/PhysRevLett.113.232301

    • Peer Reviewed
  • [Journal Article] Transverse momentum dependence of inclusive primary charged-particle production in p-Pb collisions at sqrt(sNN) = 5.02 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Eur. Phys. J.

      Volume: C74 Pages: 3054

    • DOI

      10.1140/epjc/s10052-014-3054-5

    • Peer Reviewed
  • [Journal Article] Azimuthal anisotropy of D meson production in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 90 Pages: 034904

    • DOI

      10.1103/PhysRevC.90.034904

    • Peer Reviewed
  • [Journal Article] Measurement of visible cross sections in proton-lead collisions at sqrt(sNN) = 5.02 TeV in van der Meer scans with the ALICE detector2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      JINST

      Volume: 9 Pages: P11003

    • DOI

      10.1088/1748-0221/9/11/P11003

    • Peer Reviewed
  • [Journal Article] Comparison of the space-time extent of the emission source in d+Au and Au+Au collisions at sqrt(sNN) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Nucl. Phys.

      Volume: A931 Pages: 1082-1087

    • DOI

      10.1016/j.nuclphysa.2014.08.054

    • Peer Reviewed
  • [Journal Article] Freeze-out radii extracted from three-pion cumulants in pp, pPb and PbPb collisions at the LHC2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B739 Pages: 139-151

    • DOI

      10.1016/j.physletb.2014.10.034

    • Peer Reviewed
  • [Journal Article] Measurement of quarkonium production at forward rapidity in pp collisions at sqrt(s) = 7 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Eur. Phys. J.

      Volume: C74 Pages: 2974

    • DOI

      10.1140/epjc/s10052-014-2974-4

    • Peer Reviewed
  • [Journal Article] Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p+p collisions at sqrt(s) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 90 Pages: 012007

    • DOI

      10.1103/PhysRevD.90.012007

    • Peer Reviewed
  • [Journal Article] Azimuthal-angle dependence of charged-pion-interferometry measurements with respect to second- and third-order event planes in Au+Au collisions at sqrt(sNN) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. Lett.

      Volume: 112 Pages: 222301

    • DOI

      10.1103/PhysRevLett.112.222301

    • Peer Reviewed
  • [Journal Article] Production of charged pions, kaons and protons at large transverse momenta in pp and PbPb collisions at sqrt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B736 Pages: 196-207

    • DOI

      10.1016/j.physletb.2014.07.011

    • Peer Reviewed
  • [Journal Article] Transverse-energy distributions at midrapidity in p+p, d+Au, and Au+Au collisions at sqrt(sNN) = 62.4-200 GeV and implications for particle-production models2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 89 Pages: 044905

    • DOI

      10.1103/PhysRevC.89.044905

    • Peer Reviewed
  • [Journal Article] Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at sqrt(s) = 200 and 62.4 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 90 Pages: 012006

    • DOI

      10.1103/PhysRevD.90.012006

    • Peer Reviewed
  • [Journal Article] Heavy-flavor electron-muon correlations in p+p and d+Au collisions at sqrt(sNN) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 89 Pages: 034915

    • DOI

      10.1103/PhysRevC.89.034915

    • Peer Reviewed
  • [Journal Article] Measurement of charged jet suppression in Pb-Pb collisions at sqt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      JHEP

      Volume: 1403 Pages: 013

    • DOI

      10.1007/JHEP03(2014)013

    • Peer Reviewed
  • [Journal Article] Centrality, rapidity and transverse momentum dependence of J/Psi suppression in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B734 Pages: 314-327

    • DOI

      10.1016/j.physletb.2014.05.064

    • Peer Reviewed
  • [Journal Article] System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions at sqrt(sNN) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 90 Pages: 034903

    • DOI

      10.1103/PhysRevC.90.034903

    • Peer Reviewed
  • [Journal Article] Two- and three-pion quantum statistics correlations in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV at the CERN Large Hadron Collider2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 89 Pages: 024911

    • DOI

      10.1103/PhysRevC.89.024911

    • Peer Reviewed
  • [Journal Article] Centrality categorization for Rp(d)+A in high-energy collisions2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. C

      Volume: 90 Pages: 034902

    • DOI

      10.1103/PhysRevC.90.034902

    • Peer Reviewed
  • [Journal Article] Cold-nuclear-matter effects on heavy-quark production at forward and backward rapidity in d+Au collisions at sqrt(sNN) = 200 GeV2014

    • Author(s)
      A. Adare, T. Gunji, K. Shigaki, T. Sugitate, et al. (PHENIX Collaboration)
    • Journal Title

      Phys. Rev. Lett.

      Volume: 112 Pages: 252301

    • DOI

      10.1103/PhysRevLett.112.252301

    • Peer Reviewed
  • [Journal Article] J/Psi production and nuclear effects in p-Pb collisions at sqrt(sNN) = 5.02 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      JHEP

      Volume: 1402 Pages: 073

    • DOI

      10.1007/JHEP02(2014)073

    • Peer Reviewed
  • [Journal Article] Multiplicity dependence of pion, kaon, proton and lambda production in p-Pb collisions at sqrt(sNN) = 5.02 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B728 Pages: 25-38

    • DOI

      10.1016/j.physletb.2013.11.020

    • Peer Reviewed
  • [Journal Article] Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV2014

    • Author(s)
      B. Abelev, T. Gunji, K. Shigaki, T. Sugitate, et al. (ALICE Collaboration)
    • Journal Title

      Phys. Lett.

      Volume: B728 Pages: 216-227

    • DOI

      10.1016/j.physletb.2014.05.052, 10.1016/j.physletb.2013.11.048

    • Peer Reviewed
  • [Presentation] 高エネルギー原子核衝突で探るハドロンの基礎構造2015

    • Author(s)
      K. Shigaki
    • Organizer
      日本物理学会シンポジウム
    • Place of Presentation
      早稲田大学
    • Year and Date
      2015-03-21 – 2015-03-24
    • Invited
  • [Presentation] MFT and Low Mass Di-MuonStatus and Plan2015

    • Author(s)
      K. Shigaki
    • Organizer
      2nd ALICE-France/Japan Workshop
    • Place of Presentation
      フランス・サントマキシム
    • Year and Date
      2015-03-14 – 2015-03-16
  • [Presentation] Next Stages of PHENIX for Enhanced Physics with Jets, Quarkonia, and Photons2014

    • Author(s)
      K.Shigaki (for the PHENIX Collaboration)
    • Organizer
      Asian Triangle Heavy Ion Conference 2014
    • Place of Presentation
      大阪大学
    • Year and Date
      2014-08-05 – 2014-08-08
    • Invited
  • [Presentation] Search for Intense Magnetic Field via Di-Electron Asymmetry in Pb-Pb Collisions at sqrt(sNN) = 2.76 TeV with ALICE at LHC2014

    • Author(s)
      K.Shigaki (for the ALICE Collaboration)
    • Organizer
      Quark Matter 2014
    • Place of Presentation
      ドイツ・ダルムシュタット
    • Year and Date
      2014-05-19 – 2014-05-24
  • [Presentation] Physics at High Energy Nucleus-Nucleus Colliders: Prospect and Relevance to Hadron Physics2014

    • Author(s)
      K.Shigaki
    • Organizer
      Hadron Physics Symposium
    • Place of Presentation
      名古屋大学
    • Year and Date
      2014-04-17 – 2014-04-19
    • Invited

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Published: 2016-06-01  

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