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ジェット変貌効果をプローブとしたクォーク・グルオン・プラズマ物性の研究

Research Project

Project/Area Number 09J03884
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Condensed matter physics I
Research InstitutionUniversity of Tsukuba

Principal Investigator

佐野 正人  筑波大学, 大学院・数理物質科学研究科, 特別研究員(DC1)

Project Period (FY) 2009 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2011: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2010: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2009: ¥700,000 (Direct Cost: ¥700,000)
Keywords原子核衝突 / クォーク・グルーオン・プラズマ / ジェット・クエンチング / 反応平面 / 方位角異方性 / 集団運動 / 流体的膨張 / 高エネルギー重イオン衝突実験 / ALICE / LHC / クォーク・グルオン・プラズマ / ジェット変貌効果 / ジェット / クォークグルオンプラズマ
Research Abstract

欧州原子核共同研究機構(CERN)の大型ハドロン加速器(LHC)を用いた、陽子+陽子及び、鉛+鉛原子核衝突実験(ALICE)に参加し、超相対論的重イオン衝突実験におけるクォーク・グルーオン・プラズマ(QGP)状態の性質に関する研究を行った。
多くの核子(陽子、中性子)のつまった原子核同士の衝突で期待されるQGP生成と同時に、核子の内部構造であるクォーク同士の初期散乱によるジェットの生成量が、幾何学的な核子+核子衝突の重ね合わせに比べ大きく抑制される効果「ジェット・クエンチング」を低い横運動量領域ではっきりと確認し、高い横運動量領域ではその抑制効果が小さくなっている事が分かった。宇宙初期の状態とも言われるこの高温高密度状態のQGP物質中で、高エネルギーのクォークがどのようにエネルギーを損失するのかに関する手がかりが見つかりつつある。
クォーク物質の流体的な状態とも言われるこのQGP状態の、集団運動的な効果を研究するために、衝突の反応平面に対する荷電粒子の方位角異方性の粒子種依存性、横運動量依存性、中心衝突度依存性等を測定した。この終状態における方位角異方性の測定によって、衝突初期の幾何学的形状(初期形状の統計的揺らぎを含む形状)の異方性を起源として、流体的かつ集団運動的な発展がどのように進むかを調べ、そのQGP状態の流体的膨張の様子を明らかにした。また、高エネルギークォークのエネルギー損失の大きさは、衝突初期の形状によって作られるQGP中の通過距離に依存すると考えられるので、この方位角異方性とクォークのエネルギー損失の方向との関係を調べる事により、クォークのエネルギー損失によるジェットの変貌が方位角異方性に大きく寄与している分かった。

Report

(3 results)
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (27 results)

All 2012 2011 2010 2009

All Journal Article (22 results) (of which Peer Reviewed: 19 results) Presentation (5 results)

  • [Journal Article] Measurement of Event Background Fluctuations for Charged Particle Jet Reconstruction in Pb-Pb collisions at sqrt (s_NN)=2.76 TeV2012

    • Author(s)
      B.Abelev, et al
    • Journal Title

      JHEP

      Volume: 03 Issue: 3 Pages: 53-53

    • DOI

      10.1007/jhep03(2012)053

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Particle-Yield Modification in Jetlike Azimuthal Dihadron Correlations in Pb-Pb Collisions at sqrt (s_NN)=2.76 TeV2012

    • Author(s)
      K.Aamodt, et al
    • Journal Title

      Phys.Rev.Lett.

      Volume: 108 Issue: 9 Pages: 92301-92301

    • DOI

      10.1103/physrevlett.108.092301

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Harmonic decomposition of two-particle angular correlations in Pb-Pb collisions at sqrt (sNN)=2.76 TeV2012

    • Author(s)
      K.Aamodt, et al
    • Journal Title

      Phys.Lett.B

      Volume: 708 Issue: 3-5 Pages: 249-264

    • DOI

      10.1016/j.physletb.2012.01.060

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Heavy flavour decay muon production at forward rapidity in proton-proton collisions at sqrt (s)=7 TeV2012

    • Author(s)
      K.Aamodt, et al
    • Journal Title

      Phys.Lett.B

      Volume: 708 Issue: 3-5 Pages: 265-275

    • DOI

      10.1016/j.physletb.2012.01.063

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of charm production at central rapidity in proton-proton collisions at sqrt (s)=7 TeV2012

    • Author(s)
      K.Aamodt, et al
    • Journal Title

      JHEP

      Volume: 01 Issue: 1 Pages: 128-128

    • DOI

      10.1007/jhep01(2012)128

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] J/psi polarization in pp collisions at sqrt (s)=7 TeV2012

    • Author(s)
      B.Abelev, et al
    • Journal Title

      Phys.Rev.Lett.

      Volume: 108 Pages: 82001-82001

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Light vector meson production in pp collisions at sqrt (s)=7 TeV2012

    • Author(s)
      B.Abelev, et al
    • Journal Title

      Physics Letters B

      Volume: 710 Issue: 4-5 Pages: 557-568

    • DOI

      10.1016/j.physletb.2012.03.038

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV2011

    • Author(s)
      K.Aamodt, et al
    • Journal Title

      Phys.Rev.Lett.

      Volume: 107 Issue: 3 Pages: 32301-32301

    • DOI

      10.1103/physrevlett.107.032301

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Femtoscopy of pp collisions at sqrt {s}=0.9 and 7 TeV at the LHC with two-pion Bose-Einstein correlations2011

    • Author(s)
      K.Aamodt, et al
    • Journal Title

      Phys.Rev.D

      Volume: 84 Issue: 11 Pages: 112004-112004

    • DOI

      10.1103/physrevd.84.112004

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Production of pions, kaons and protons in pp collisions at √<s>=900 GeV with ALICE at the LHC2011

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      arXiv

      Volume: 1101.4110

    • Related Report
      2010 Annual Research Report
  • [Journal Article] Two-pion Bose-Einstein correlations in central Pb-Pb collisions at √<S_<NN>>=2.76 TeV2011

    • Author(s)
      ALICE Collaboration (K.Aemodt, et al.)
    • Journal Title

      Physics Review B

      Volume: Vol.696 Pages: 328-337

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at √<S_<NN>>=2.76TeV.2011

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      Physics Review Letter

      Volume: Vol.106 : 082801

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb--Pb Collisions at √<S_<NN>>=2.76TeV2011

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      Physics Review B

      Volume: Vol.696 Pages: 30-39

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Charged-particle multiplicity density at mid-rapidity in central Pb-Pb collisions at √<S_<NN>>=2.76Tev2010

    • Author(s)
      ALICE Collaboration (K.Aemodt, et al.)
    • Journal Title

      Physics Review Letter

      Volume: Vol.105 : 262301

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV2010

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      arXiv

      Volume: 1011.3914

    • Related Report
      2010 Annual Research Report
  • [Journal Article] ALICE EMCal Physics Performance Report2010

    • Author(s)
      ALICE EMCal Collaboration (U.Abeysekara, et al.)
    • Journal Title

      arXiv

      Volume: 1008.0413

    • Related Report
      2010 Annual Research Report
  • [Journal Article] Transverse momentum spectra of charged particles in proton-proton collisions at√<s>=900GeV with ALICE at the LHC2010

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      Physics Review B

      Volume: Vol.693 Pages: 53-68

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Two-pion Bose-Einstein correlations in pp collisions at √<s>=900GeV2010

    • Author(s)
      ALICE Collaboration (K.Aemodt, et al.)
    • Journal Title

      Physics Review D

      Volume: Vol.82 : 062001

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Midrapidity antiproton-to-proton ratio in pp collisions at √<s>=0.9 and 7TeV measured by the ALICE experiment2010

    • Author(s)
      ALICE Collaboration (K.Aemodt, et al.)
    • Journal Title

      Physics Review Letter

      Volume: Vol.106 : OT2002

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Charged-particle multiplicity measurement in proton-proton collisions at √<s>=7TeV with ALICE at LHC2010

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      European Physical Journal C

      Volume: Vol.68 Pages: 345-354

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Charged-particle multiplicity measurement in proton-proton collisions at √<s>=0.9 and 2.36 TeV with ALICE at LHC.2010

    • Author(s)
      ALICE Collaboration (K.Aamodt, et al.)
    • Journal Title

      European Physical Journal C

      Volume: Vol.68 Pages: 89-108

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] First proton-proton collisions at the LHC as observed with the ALICE detector : measurement of the charged particle pseudorapidity density at sqrt(s)=900GeV2010

    • Author(s)
      ALICE collaboration, K.aamodt, M.Sano
    • Journal Title

      The European Physical Journal C Volume 65

      Pages: 111-125

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] Systematic study of elliptic and higher order harmonics by event planemethod in Pb-Pb 2.76 TeV collisions at LHC-ALICE2011

    • Author(s)
      Masato Sano for ALICE collaboration
    • Organizer
      The Seventh Workshop on Particle Correlations and Femtoscopy (WPCF2011)
    • Place of Presentation
      Univ.of Tokyo(文京区)
    • Year and Date
      2011-09-24
    • Related Report
      2011 Annual Research Report
  • [Presentation] The measurement of identified charged hadron elliptic flow and higher order harmonics in √sNN=2.76TeV Pb+Pb collisions at LHC-ALICE2011

    • Author(s)
      佐野正人for ALICE collaboration
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      弘前大学(弘前市)
    • Year and Date
      2011-09-16
    • Related Report
      2011 Annual Research Report
  • [Presentation] Elliptic flow measurement in 2.76TeV Pb+Pb collisions at LHC-ALICE2011

    • Author(s)
      佐野正人for ALICE collaboration
    • Organizer
      日本物理学会
    • Place of Presentation
      新潟大学
    • Year and Date
      2011-03-25
    • Related Report
      2010 Annual Research Report
  • [Presentation] Measurement of jet property via di-hadron correlation in p+p collisions at LHC-ALICE2010

    • Author(s)
      佐野正人for ALICE collaboration
    • Organizer
      日本物理学会
    • Place of Presentation
      九州工業大学
    • Year and Date
      2010-09-13
    • Related Report
      2010 Annual Research Report
  • [Presentation] Study of jet trigger with ALICE EMCAL for PbPb 5.5 TeV2009

    • Author(s)
      佐野正人
    • Organizer
      Third Joint Meeting of Nuclear Physics Divisions of the APS and JPS
    • Place of Presentation
      アメリカ合衆国ハワイ島Hilton Wikoloa Village
    • Year and Date
      2009-10-17
    • Related Report
      2009 Annual Research Report

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Published: 2009-04-01   Modified: 2024-03-26  

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