• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

5.5TeV重イオン衝突における仮想光子を用いたクォークグルーオンプラズマの研究

Research Project

Project/Area Number 09J03434
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

洞口 拓磨  筑波大学, 大学院・数理物質科学研究科, 特別研究員(PD)

Project Period (FY) 2009 – 2011
Project Status Completed (Fiscal Year 2010)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2010: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2009: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywords高エネルギー原子核実験 / クォーク・グルーオンプラズマ / 量子色力学
Research Abstract

LHC-ALICE実験における低い横運動量領域の光子測定は、量子色力学の非摂動論的領域を理解する上で非常に重要である。私は今年度、重心系エネルギー900GeV及び7TeVの陽子-陽子衝突ににおいて、横運動領域が高い場合と低い場合に事象を分け、それぞれの場合について荷電粒子における累積的粒子相関を測定した。これは、衝突の運動量移行が小さく、量子色力学の摂動計算が破綻する運動量領域での情報を得ることが出来るという点で、本研究課題である低い横運動量領域での光子測定の参照データと成り得る。また、粒子間の角度相関を見ることから、陽子の形状に起因した衝突パラメーターの違いを事象毎に観測できるのではないかという期待があった。今回の測定では、十分な統計が得られずこのような仮説を裏付けるような精度を達成することは出来なかったが、
低い横運動領域での荷電粒子の振る舞いを良く理解することができ、本研究課題である低い横運動量領域での光子測定に重要な寄与をすることが出来た。
更に、筑波大学で推進するDiJetカロリメーターの検出器シミュレーションの作成に昨年度末から引き続き取り組んだ。検出器位置の示す描画ツールを整備する等、ユーザインタフェースの拡充に努めた。このカロリメーターのシミュレーションは、ALICE遷移放射検出器(TRD)と組み合わせた電子識別向上のテストに活用した。また、ジェット内で相関を持つ電子対の影響を正しく見積もるために、従来設置されているALICE電磁カロリメーター(EMCAL)との組み合わせることでより系統誤差の少ない測定が出来ると期待される。

Report

(2 results)
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (32 results)

All 2011 2010 2009 Other

All Journal Article (24 results) (of which Peer Reviewed: 24 results) Presentation (6 results) Remarks (2 results)

  • [Journal Article] Two-pion Bose-Einstein correlations in central Pb-Pb collisions at √<sNN>=2.76TeV2011

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      Phys. Lett. B

      Volume: 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 √<sNN>=2.76TeV2011

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      Phys. Rev. Lett

      Volume: 106 Pages: 32301-32301

    • 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 √<sNN>=2.76TeV2011

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      Phys. Lett. B

      Volume: 696 Pages: 30-39

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cross section and double helicity asymmetry for η mesons and their comparison to neutral pion production in p+p collisions at √<s>=200GeV2011

    • Author(s)
      A.Adare, 他
    • Journal Title

      Phys. Rev. D

      Volume: 83

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cross section and parity violating spin asymmetries of W+- boson production in polarized p+p collisions at√<s>=500GeV2011

    • Author(s)
      C.Adare, 他
    • Journal Title

      Phy. Rev. Lett

      Volume: 106

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Charged particle multiplicity density at mid-rapidity in central Pb-Pb collisions at √<sNN>=2.76TeV2010

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      Phys. Rev. Lett

      Volume: 105 Pages: 252301-252301

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of transverse single-spin asymmetries for J/psi production in polarized p+p collisions at √<s>=200GeV2010

    • Author(s)
      B.Adare, 他
    • Journal Title

      Phys. Rev. D

      Volume: 82

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

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      Phys. Lett. B

      Volume: 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)
      K.Aamodt, 他
    • Journal Title

      Phy. Rev. D

      Volume: 82

    • 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)
      K.Aamodt, 他
    • Journal Title

      Phy. Rev. Lett

      Volume: 105

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Azimuthal anisotropy of neutral pion production in Au+Au collisions at √<sNN>=200GeV : path-length dependence of jet quenching and the role of initial geometry2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Phy. Rev. Lett

      Volume: 105

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High pT direct photon and pi0 triggered azimuthal jet correlations and measurement of kT for isolated direct photons in p+p collisions at√<s>=200GeV2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Phy. Rev. D

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Transverse momentum dependence of meson suppression η suppression in Au+Au collisions at √<sNN>=200GeV2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Phy. Rev. C

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of neutral mesons in p+p collisions at√<s>=200GeV and scaling properties of hadron production2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Phy. Rev. D

      Volume: 83

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nuclear modification factor of phi mesons in d+Au, Cu+Cu and Au+Au collisions at √<sNN>=200GeV2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Phy. Rev. C

      Volume: 83

    • 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)
      K.Aamodt, 他
    • Journal Title

      Eur. Phys. J.C

      Volume: 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 2.36TeV with ALICE at LHC2010

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      Eur. Phys. J.C

      Volume: 68 Pages: 89-108

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pseudorapidity density at vs=900GeV2010

    • Author(s)
      K.Aamodt, 他
    • Journal Title

      European Physical Journal C 65

      Pages: 111-125

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Detaile measurement of the e+ e- pair continuum in p+p and Au+Au collisions at vs NN=200GeV and implications for direct photon production2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Physical Review C 81

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Double Helicity Dependence of Jet Properties from Dihadrons in Longitudinally Polarized p+p Collisions At Vs=200GeV2010

    • Author(s)
      A.Adare, 他
    • Journal Title

      Physical Review C 81

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Systematic Studies of Elliptic Flow Measurements in Au+Au Collisions at Vs NN=200GeV2009

    • Author(s)
      S.Afanasiev, 他
    • Journal Title

      Physical Review C 80

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-pT piO Production with Respect to the Reaction Plane in Au+Au Collisions at Vs NN=200GeV2009

    • Author(s)
      S.Afanasiev, 他
    • Journal Title

      Physical Review C 80

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Kaon interferometric probes of space-time evolution in Au+Au collisions at Vs NN=200GeV2009

    • Author(s)
      S.Afanasiev, 他
    • Journal Title

      Physical Review Letter 103

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of Bottom versus Charm as a Function of Transverse Momentum with Electrom-Hadron Correlations in p+p Collisions at Vs NN=200GeV2009

    • Author(s)
      A.Adare, 他
    • Journal Title

      Physical Review Letter 103

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] Soft Physics at LHC-ALICE2010

    • Author(s)
      洞口拓磨
    • Organizer
      日本物理学会秋季学会
    • Place of Presentation
      九州工業大学
    • Year and Date
      2010-09-13
    • Related Report
      2010 Annual Research Report
  • [Presentation] Study of DiJet Reconstruction in p+p and Pb+Pb Collisions with DCAL at LHC-ALICE2010

    • Author(s)
      T.Horaguchi
    • Organizer
      Jet in Proton-Proton & Heavy Ion Collisions
    • Place of Presentation
      Prague,チェコ共和国
    • Year and Date
      2010-08-14
    • Related Report
      2010 Annual Research Report
  • [Presentation] LHC-ALIC実験における低い横運動量領域での光子測定2010

    • Author(s)
      洞口拓磨
    • Organizer
      日本物理学会第65回年次大会
    • Place of Presentation
      岡山大学
    • Year and Date
      2010-03-20
    • Related Report
      2009 Annual Research Report
  • [Presentation] ALICE Analysis Status @ Tsukuba ~Practice on GRID/CAF~2010

    • Author(s)
      T.Horaguchi
    • Organizer
      ALICE Analysis Workshop
    • Place of Presentation
      Hiroshima University, Japan
    • Year and Date
      2010-01-21
    • Related Report
      2009 Annual Research Report
  • [Presentation] Photon Physics & J-Cal2009

    • Author(s)
      T.Horaguchi
    • Organizer
      The Workshop of ALICE Upgrades by Asian Countries
    • Place of Presentation
      Yonsei University, KOREA
    • Year and Date
      2009-11-05
    • Related Report
      2009 Annual Research Report
  • [Presentation] Photon Physics at LHC-ALICE2009

    • Author(s)
      T.Horaguchi
    • Organizer
      HAWAII2009 (Third Joint Meeting of the Nuclear Physics Division of the APS and JPS)
    • Place of Presentation
      HAWAII, USA
    • Year and Date
      2009-10-15
    • Related Report
      2009 Annual Research Report
  • [Remarks]

    • URL

      http://aliceinfo.cern.ch/Collaboration/index.html

    • Related Report
      2010 Annual Research Report
  • [Remarks]

    • URL

      http://aliceinfo.cern.ch/Collaboration/index.html

    • Related Report
      2009 Annual Research Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi