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2010 Fiscal Year Annual Research Report

超高エネルギーハドロン衝突からの光子測定を可能とする電磁カロリメータの開発

Research Project

Project/Area Number 22244022
Research InstitutionThe University of Tokyo

Principal Investigator

濱垣 秀樹  東京大学, 大学院・理学系研究科, 准教授 (90114610)

Co-Investigator(Kenkyū-buntansha) 郡司 卓  東京大学, 大学院・理学系研究科, 助教 (10451832)
黒澤 真城  独立行政法人理化学研究所, 仁科加速器センター, 基礎科学特別研究員 (10462681)
Keywords原子核(実験)
Research Abstract

高エネルギーでのハドロン衝突時の粒子生成に重要な役割を果たす小さなBjorken-x領域での陽子及び原子核のグルーオン分布関数であるが、QCD理論的にはグルーオン飽和というQCDの本来的な非線形性に由来する面白い課題を提供する。現状では、実験データの不足により大きな不定性を持っているが、CERN LHC加速器でのp+p、p+Pb衝突において前方(擬rapidity η=・・・・・・)に放出される単光子や中性パイ中間子の収量を測定することで、小さなx領域でのグルーオン密度を実験的に決定できると考えられる。
本研究は、その測定に最適化した前方トラッキング型電磁カロリメータを開発することを目的とする。
平成22年度は、以下の項目について進めた。(1)直接光子とジェット起源の中性π中間子の測定についてpythiaを用いたシミュレーションによる考察。(2)電磁カロリメータへの要求仕様(擬rapidity範囲:2.5-4.5、運動量範囲:1GeV/c-200GeV/c、二光子分離能:0.6cm、多重粒子分離能:0.1/cm2)の妥当性の事象シミュレーションを用いた検証。(3)要求仕様に合う検出器の概念設計。(4)プロトタイプの製作(メカニカル部):シリコンパッド型検出器とストリップ型検出器の購入。検出器要素組み立て用治具の製作。タングステン板の製作。(5)プロトタイプの製作(読み出し部):ASIC読み出し回路の設計・試作。ASIC読み出し回路(第2版)の設計。

  • Research Products

    (18 results)

All 2010

All Journal Article (16 results) (of which Peer Reviewed: 16 results) Presentation (2 results)

  • [Journal Article] First proton-proton collisions at the LHC as observed with the ALICE detector : Measurement of the charged particle pseudorapidity density at s**(1/2)=900-GeV2010

    • Author(s)
      K.Aamodt, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Eur.Phys.J.C

      Volume: 65 Pages: 111-125

    • Peer Reviewed
  • [Journal Article] Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s)=7 TeV with ALICE at LHC2010

    • Author(s)
      K.Aamodt, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Eur.Phys.J.C

      Volume: 68 Pages: 345-354

    • Peer Reviewed
  • [Journal Article] Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s)=0.9 and 2.36 TeV with ALICE at LHC2010

    • Author(s)
      K.Aamodt, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Eur.Phys.J.C

      Volume: 68 Pages: 89-108

    • Peer Reviewed
  • [Journal Article] Double-Helicity Dependence of Jet Properties from Dihadrons in Longitudinally Polarized p+p Collisions at √s=200 GeV2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.D

      Volume: 81 Pages: 012002

    • Peer Reviewed
  • [Journal Article] Detailed measurement of the e+e-pair continuumin p+p and Au+Au collisions at√sNN=200 GeV and implications for direct photon production2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.C

      Volume: 81 Pages: 034911

    • Peer Reviewed
  • [Journal Article] Transverse momentum dependence of J/psi polarization at midrapidity in p+p collisions at s**(1/2)=200-GeV2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.D

      Volume: 82 Pages: 012001

    • Peer Reviewed
  • [Journal Article] Trends in Yield and Azimuthal Shape Modification in Dihadron Correlations in Relativistic Heavy Ion Collisions2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.Lett.

      Volume: 104 Pages: 252301

    • Peer Reviewed
  • [Journal Article] Elliptic and hexadecapole flow of charged hadron in Au+Au collisions at sqrt(s_NN)=200 GeV2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.Lett.

      Volume: 105 Pages: 062301

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

    • Author(s)
      K.Aamodt, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Phys.Rev.Lett.

      Volume: 105 Pages: 072002

    • Peer Reviewed
  • [Journal Article] Transverse momentum dependence of meson suppression in Au+Au collisions at √sNN=200 GeV2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.C

      Volume: 82 Pages: 011902

    • Peer Reviewed
  • [Journal Article] Azimuthal anisotropy of neutral pion production in Au+Au collisions at √sNN=200 GeV : Path-length dependence of jet quenching and the role of initial geometry2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.Lett.

      Volume: 105 Pages: 142301

    • Peer Reviewed
  • [Journal Article] High pT direct photon and π0 triggered azimuth jet correlations and measurement of kT for isolated direct photons in p+p collisions at arts=200 GeV2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.D

      Volume: 82 Pages: 072001

    • Peer Reviewed
  • [Journal Article] Transverse momentum spectra of charged particles in proton-proton collisions at √s=900~GeV with ALICE at the LHC2010

    • Author(s)
      K.Aamodt, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Phys.Lett.B

      Volume: 693 Pages: 53-68

    • Peer Reviewed
  • [Journal Article] Charged-particle multiplicity density at mid-rapidity in central Pb-Pb collisions at √sNN=2.76 TeV2010

    • Author(s)
      B.Abelev, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Phys.Rev.Lett.

      Volume: 105 Pages: 252301

    • Peer Reviewed
  • [Journal Article] Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV2010

    • Author(s)
      K.Aamodt, H.Hamagaki, 他(ALICE Collaboration)
    • Journal Title

      Phys.Rev.Lett.

      Volume: 105 Pages: 252302

    • Peer Reviewed
  • [Journal Article] Measurement of Transverse Single-Spin Asymmetries for J/psi Production in Polarized p+p Collisions at sqrt(s)=200 GeV2010

    • Author(s)
      A.Adare, H.Hamagaki, 他(PHENIX Collaboration)
    • Journal Title

      Phys.Rev.D

      Volume: 82 Pages: 112008

    • Peer Reviewed
  • [Presentation] First results from the ALICE experiment at LHC2010

    • Author(s)
      Hideki Hamagaki
    • Organizer
      5th Nishinomiya-Yukawa Memorial International Workshop on High Energy Strong Interactions 2010 : HESI10
    • Place of Presentation
      京都大学基礎物理学研究所(招待講演)
    • Year and Date
      2010-08-12
  • [Presentation] Simulation study for forward calorimeter in LHC-ALICE experiment2010

    • Author(s)
      Y.Hori, H.Hamagaki, T.Gunji
    • Organizer
      14th International Conference on Calorimetry in High Energy Physics (CALOR 2010)
    • Place of Presentation
      中国北京
    • Year and Date
      2010-05-11

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Published: 2013-06-26  

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