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ハドロン多体系におけるハドロン励起状態の研究

Research Project

Project/Area Number 20028004
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionKyoto University

Principal Investigator

慈道 大介  Kyoto University, 基礎物理学研究所, 助教 (30402811)

Project Period (FY) 2008 – 2010
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2009: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2008: ¥800,000 (Direct Cost: ¥800,000)
Keywords理論核物理 / 量子色力学 / ハドロン物理学 / ストレンジネス / ハドロン励起状態 / エキゾチックハドロン / 中間子原子核 / ハドロン分子状態 / カイラル対称性
Research Abstract

本研究では、ハドロン励起状態の構造に関してハドロン的描像に立って研究を行った。また、バリオン励起状態が重要な役割を担うと予想されている中間子原子核の生成反応や、中間子の核媒質中での性質、エキゾチックハドロンである(-)バリオンの構造に対する研究を行った。主要な研究成果について記す。
(1) Λ(1405)励起状態の生成反応の理論的研究
Λ(1405)は生成される過程によって、スペクトラムの形が変わると予想されている。本研究では、反K中間子と重陽子の反応を用いれば、Λ(1405)が反K中間子と核子から生成されることをつきとめ、実験で観測されるスペクトラムの理論的予想を行った。今後、行われる実験に対し重要な示唆を与えた。
(2) 中間子原子核の生成断面積とK中間子原子核の崩壊過程
η中間子原子核とK中間子原子核の生成断面積を理論的に計算し、実験で得られる生成スペクトラムの計算を行った。また、Λ(1405)を反K中間子と核子の準束縛状態であるという描像に立って、核媒質中の反K中間子がどのように吸収されるを理論的に予想した。
(3) 核媒質中でのハドロンの性質
a1中間子がρとπ中間子のハドロン共鳴であるという立場にたって、核媒質中でのa1中間子の性質を調べた。密度が高くなるにつれ、a1中間子の崩壊幅は大きくなるが、ρ中間子と縮退する傾向であることを確認し、核媒質中でのカイラル対称性の部分的回復の理解に対し重要な示唆を得た。また、中性子星などの高密度状態でπ中間子が凝縮する可能性を、π中間子に対する現在の現象論的知見から検討をし、π中間子凝縮の可能性が小さいことを示した。
(4) QCD和則における(-)バリオン
QCD和則を用いて、(-)バリオンの量子数を決定した。実験で観測されている(-)バリオンは、アイソスピン0、スピン3/2、正パリティーを持つ可能性が高いことがわかり、他の量子数を持ったペンタクォーク状態も存在する可能性があることを指摘した。

Report

(2 results)
  • 2009 Annual Research Report
  • 2008 Annual Research Report
  • Research Products

    (36 results)

All 2010 2009 2008

All Journal Article (21 results) (of which Peer Reviewed: 21 results) Presentation (15 results)

  • [Journal Article] The nature of Lambda(1405) hyperon resonance in chiral dynamics2010

    • Author(s)
      D.Jido, T.Sekihara, Y.Ikeda, T.Hyodo, Y.Kanada-En'yo, E.Oset
    • Journal Title

      Nuclear Physics A835

      Pages: 59-66

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Possible quantum numbers of the pentaquark Theta^+(1540) in QCD sumrules2009

    • Author(s)
      P.Gubler, D.Jido, T.Kojo, T.Nishikawa, M.Oka
    • Journal Title

      Physical Review D80

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Kaonic production of Lambda(1405) off deuteron target in chiral dynamics2009

    • Author(s)
      D.Jido, E.Oset, T.Sekihara
    • Journal Title

      The European Physical Journal A42

      Pages: 257-268

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Lambda(1405)-induced non-mesonic decay in kaonic nuclei2009

    • Author(s)
      T.Sekihara, D.Jido, Y.Kanada-En'yo
    • Journal Title

      Physical Review C79

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin-3/2 Pentaquark in QCD Sum Rules2009

    • Author(s)
      P.Gubler, D.Jido, T.Kojo, T.Nishikawa, M.Oka
    • Journal Title

      Physical Review D79

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Formation spectra of light kaonic nuclei by in-flight (Kbar,N) reactions with chiral unitary amplitude2009

    • Author(s)
      J.Yamagata-Sekihara, D.Jido, H.Nagahiro, S.Hirenzaki
    • Journal Title

      Physical Review C80

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium2009

    • Author(s)
      Hideko Nagahiro, Daisuke Jido, Satoru Hirenzaki
    • Journal Title

      Physical Review C80

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Possibility of an s-wave pion condensate in neutron stars reexamined2009

    • Author(s)
      A.Ohnishi, D.Jido, T.Sekihara, K.Tsubakihara
    • Journal Title

      Physical Review C80

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anew N^* resonance as a hadronic molecular state2009

    • Author(s)
      Daisuke Jido, Yoshiko Kanada-En'yo
    • Journal Title

      Chinese Physics C33

      Pages: 1312-1317

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Baryon resonances as hadronic molecule states with kaons2009

    • Author(s)
      Daisuke Jido, Yoshiko Kanada-En'yo
    • Journal Title

      Hyperfine interactions 193

      Pages: 253-259

    • NAID

      120002098848

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Transition.form factors of the N*(1535) as a dynamically generated resonance2008

    • Author(s)
      D. Jido, M. Daring, E. Oset
    • Journal Title

      Physical Review C77

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Level crossing of particle-hole and mesonic modes in eta-mesonic nuclei2008

    • Author(s)
      D. Jido, E. E. Kolomeitsev, H. Nagahiro, S. Hirenzaki
    • Journal Title

      Nuclear Physics A811

      Pages: 158-178

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Sigma meson in pole-dominated QCD sum rules2008

    • Author(s)
      Toru Kojo, Daisuke Jido
    • Journal Title

      Physical Review D78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Origin of the resonances in the chiral unitary approach2008

    • Author(s)
      Tetsuo Hyodo, Daisuke Jido, Atsushi Hosaka
    • Journal Title

      Physical Review C78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electromagnetic mean squared radii of Lambda(1405) in chiral dynamics2008

    • Author(s)
      T. Sekihara, T. Hyodo, D. Jido
    • Journal Title

      Physics Letters B669

      Pages: 133-138

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On the nature of the Lambda(1405) and Lambda (1670) from their Nc behavior in chiral dynamics2008

    • Author(s)
      L. Roca, T. Hyodo, D. Jido
    • Journal Title

      Nuclear Physics A809

      Pages: 65-87

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anti-k anti-K N molecule state in three-body calculation2008

    • Author(s)
      Yoshiko Kanada-En' yo, Daisuke Jido
    • Journal Title

      Physical Review C78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In-medium Pion and Partial Restoration Chiral Symmetry2008

    • Author(s)
      D. Jido, T. Hatsuda, T. Kunihiro
    • Journal Title

      Physics Letters B670

      Pages: 109-113

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] K anti-K N molecule state with I=1/2 and J P=1/2+ studied with three-body calculation2008

    • Author(s)
      Daisuke Jido, Yoshiko Kanada-En' yo
    • Journal Title

      Physical Review C78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] QCD Sum Rules and 1/Nc expansion2008

    • Author(s)
      Toni Kojo, Daisuke Jido
    • Journal Title

      Progress of Theoretical Physics Suppletent 174

      Pages: 258-261

    • NAID

      210000128607

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Structure of N(1535) in the aspect of chiral symmetry2008

    • Author(s)
      Daisuke Jido, Tetsuo Hyodo, Atsushi Hosaka
    • Journal Title

      Mordern Physics Letters A23

      Pages: 2389-2392

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] Partial restoration of chiral symmetry in nuclei2010

    • Author(s)
      慈道大介
    • Organizer
      New Frontiers in QCD-Exotic Hadron Systems and Dense Matter-
    • Place of Presentation
      京都大学基礎物理学研究所、京都市
    • Year and Date
      2010-02-18
    • Related Report
      2009 Annual Research Report
  • [Presentation] カイラル動力学によるΛ(1405)の構造の研究2009

    • Author(s)
      慈道大介
    • Organizer
      科研費特定領域と新学術領域による研究会「ストレンジネスから新ハドロンヘ」
    • Place of Presentation
      大阪大学荒田記念館、吹田市
    • Year and Date
      2009-12-11
    • Related Report
      2009 Annual Research Report
  • [Presentation] Chiral doublet model2009

    • Author(s)
      慈道大介
    • Organizer
      Workshop on Algebraic aspect of chiral symmetry for the study of excited baryons
    • Place of Presentation
      京都大学基礎物理学研究所、京都市
    • Year and Date
      2009-11-05
    • Related Report
      2009 Annual Research Report
  • [Presentation] Recent topics of hadrons in nuclei (Keynote talk)2009

    • Author(s)
      慈道大介
    • Organizer
      Third Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and The Physical Society of Japan
    • Place of Presentation
      ワイコロア、ハワイ、アメリカ合衆国
    • Year and Date
      2009-10-15
    • Related Report
      2009 Annual Research Report
  • [Presentation] Baryon Resonances as Hadronic Molecular State2009

    • Author(s)
      慈道大介
    • Organizer
      US-Japan Joint Workshop on Meson Production Reactions at Jefferson Lab and J-PARC
    • Place of Presentation
      ワイコロア、ハワイ、アメリカ合衆国
    • Year and Date
      2009-10-12
    • Related Report
      2009 Annual Research Report
  • [Presentation] The nature of Λ(1405) in chiral dynamics2009

    • Author(s)
      慈道大介
    • Organizer
      10th International conference on Hypernuclear and Strange Particle Physics
    • Place of Presentation
      東海村、茨城県
    • Year and Date
      2009-09-14
    • Related Report
      2009 Annual Research Report
  • [Presentation] K-induced production of Lambda(1405) with deuteron target in chiral dynamics2009

    • Author(s)
      慈道大介
    • Organizer
      Mini-Workshop on KbarN and KbarNN
    • Place of Presentation
      理化学研究所、和光市
    • Year and Date
      2009-05-11
    • Related Report
      2009 Annual Research Report
  • [Presentation] A new N^* resonance as a hadronic molecular state2009

    • Author(s)
      慈道大介
    • Organizer
      Workshop on the Physics of Excited Nucleon-NSTAR2009
    • Place of Presentation
      中国科学院高能物理研究所、北京、中国
    • Year and Date
      2009-04-22
    • Related Report
      2009 Annual Research Report
  • [Presentation] Λ(1405)のエキゾチックな構造がもたらすK中間子原子核物理(招待講演)2009

    • Author(s)
      慈道大介
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学(東京都豊島区)
    • Year and Date
      2009-03-29
    • Related Report
      2008 Annual Research Report
  • [Presentation] K- induced production of A(1405) with deuteron target in chiral dynamics2009

    • Author(s)
      慈道大介
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学(東京都豊島区)
    • Year and Date
      2009-03-27
    • Related Report
      2008 Annual Research Report
  • [Presentation] Hadronic molecular states in baryon resonances2008

    • Author(s)
      慈道大介
    • Organizer
      RCNP研究会「少数粒子系物理の現状と今後の展望」
    • Place of Presentation
      大阪大学核物理研究センター(茨木市)
    • Year and Date
      2008-12-25
    • Related Report
      2008 Annual Research Report
  • [Presentation] Structure of the N(1535) in chiral dynamics2008

    • Author(s)
      慈道大介
    • Organizer
      orkshop on Hadron Dynamics
    • Place of Presentation
      Almunyecar、スペイン
    • Year and Date
      2008-09-25
    • Related Report
      2008 Annual Research Report
  • [Presentation] Baryon resonances as hadronic molecule states with kaons2008

    • Author(s)
      慈道大介
    • Organizer
      International Conference on Exotic Atoms (EXA2008)
    • Place of Presentation
      ウィーン市、オーストリア
    • Year and Date
      2008-09-16
    • Related Report
      2008 Annual Research Report
  • [Presentation] J-PARCにおける原子核中のハドロン2008

    • Author(s)
      慈道大介
    • Organizer
      「J-PARCハドロン物理の将来研究計画を考える」研究会
    • Place of Presentation
      理化学研究所(和光市)
    • Year and Date
      2008-09-02
    • Related Report
      2008 Annual Research Report
  • [Presentation] Baryon resonances as hadronic molecule states2008

    • Author(s)
      慈道大介
    • Organizer
      RCNP研究会「Challenge to new exotic hadrons」
    • Place of Presentation
      大阪大学核物理研究センター(茨木市)
    • Year and Date
      2008-07-31
    • Related Report
      2008 Annual Research Report

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Published: 2008-04-01   Modified: 2018-03-28  

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