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2013 Fiscal Year Annual Research Report

多彩なフレーバーがもたらすクォークハドロン物質の新形態に関する理論研究

Planned Research

Project AreaQuest on new hadrons with variety of flavors
Project/Area Number 21105006
Research InstitutionOsaka University

Principal Investigator

保坂 淳  大阪大学, 核物理研究センター, 教授 (10259872)

Co-Investigator(Kenkyū-buntansha) 菅沼 秀夫  京都大学, 理学(系)研究科(研究院), 准教授 (10291452)
原田 正康  名古屋大学, 理学(系)研究科(研究院), 教授 (40311716)
森松 治  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (60210184)
竹内 幸子  日本社会事業大学, 社会福祉学部, 教授 (90251503)
Project Period (FY) 2009-07-23 – 2014-03-31
Keywordsエキゾチックハドロン / フレーバー / 重いクォーク / ハドロン分子 / カイラル対称性 / 閉じ込め
Research Abstract

重いクォークを含む系で顕著になるハドロンの分子構造の出現機構と、データとの比較において最も重要な成果を得ることができた。以下、具体的な成果の例を挙げる。
(1)X(3872)に対して、D中間子の分子状態にccbarクォーコニウムが少し混合することで、質量や崩壊の性質を説明することができた。敷居近傍のためアイソスピン破れの効果が重要性となることを示した(竹内)。(2)重いクォークを含むエキゾチックハドロン系の理論研究では、Belleで発見されたZb粒子を2個のB中間子の分子状態として記述することで、質量と崩壊の性質を説明することができた。また未知の粒子の存在を予言するとともに、崩壊パターンに重いクォーク対称性が現れる機構を示した(保坂)。(3)ホログラフィック有効模型により核子の形状因子を解析し、重いベクトル中間子が観測される可能性を示唆した(原田)(4)格子QCDにより、カイラル対称性の破れが真空の低エネルギー領域の性質に依存する一方、閉じ込めポテンシャルは低エネルギーモードには依存しないことを示した。数値的に示すとともに、解析的にも示すことができた(菅沼)。
(5)重いクォークの極限で見られる縮退の性質を明らかにし、(1),(2)などで実現されている重いハドロンの分子状態に適用した。2体系のみならず3体系においても縮退が見られること、そのパターンを明らかにした(保坂)。(6)高エネルギー反応のクォークカウンティング則により、粒子のエキゾチックな性質を調べる方法を提案した(森松/熊野)。

Current Status of Research Progress
Reason

25年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

25年度が最終年度であるため、記入しない。

  • Research Products

    (30 results)

All 2014 2013

All Journal Article (21 results) (of which Peer Reviewed: 21 results) Presentation (9 results) (of which Invited: 7 results)

  • [Journal Article] Strategies for an accurate determination of the X(3872) energy from QCD lattice simulations2014

    • Author(s)
      E. J. Garzon, R. Molina, A. Hosaka and E. Oset
    • Journal Title

      Phys. Rev. D

      Volume: 89 Pages: 014504

    • Peer Reviewed
  • [Journal Article] Quark Scalar, Axial and Pseudoscalar Charges in the Schwinger-Dyson Formalism2014

    • Author(s)
      N. Yamanaka, S. Imai, T.M. Doi and H. Suganuma
    • Journal Title

      Phys. Rev. D

      Volume: 89 Pages: 074017:1-26

    • Peer Reviewed
  • [Journal Article] Tomography of exotic hadrons in high-energy exclusive processes2014

    • Author(s)
      H. Kawamura, S. Kumano
    • Journal Title

      Phys. Rev. D

      Volume: 89 Pages: 054007, 1-13

    • Peer Reviewed
  • [Journal Article] Enhancement of Chiral Symmetry Breaking from the Pion condensation at finite isospin chemical potential in a holographic QCD model2014

    • Author(s)
      Hiroki Nishihara, Masayasu Harada
    • Journal Title

      Phys.Rev. D

      Volume: 89 Pages: 076001:1-8

    • Peer Reviewed
  • [Journal Article] Lattice QCD Analysis of the Polyakov Loop in terms of Dirac Eigenmodes2014

    • Author(s)
      T. Iritani and H. Suganuma
    • Journal Title

      Prog. Theor. Exp. Phys.

      Volume: 3 Pages: 1-20

    • DOI

      10.1093/ptep/ptu030

    • Peer Reviewed
  • [Journal Article] Radiative X(3872) Decays in Charmonium-Molecule Hybrid Model2014

    • Author(s)
      Makoto Takizawa and Sachiko Takeuchi, and Kiyotaka Shimizu
    • Journal Title

      Phys. Rev. D

      Volume: 10.1007/s00601-014-0830-6 Pages: 1-4

    • Peer Reviewed
  • [Journal Article] Role of vector and pseudoscalar mesons in understanding 1=1/2- N* and Δ resonances2013

    • Author(s)
      K. P. Khemchandani, A. Martinez Torres, H. Nagahiro and A. Hosaka
    • Journal Title

      Phys. Rev. D

      Volume: 88 Pages: 114016

    • Peer Reviewed
  • [Journal Article] Composite and elementary nature of a resonance in the sigma model2013

    • Author(s)
      H. Nagahiro and A. Hosaka
    • Journal Title

      Phys. Rev. C

      Volume: 88 Pages: 055203

    • Peer Reviewed
  • [Journal Article] Hadronic molecules for charmed and bottom baryons near thresholds2013

    • Author(s)
      Y. Yamaguchi, S. Ohkoda, S. Yasui and A. Hosaka
    • Journal Title

      Phys. Rev. D

      Volume: 87, no. 7 Pages: 074019

    • Peer Reviewed
  • [Journal Article] K*Σ photoproduction off the proton target with baryon resonances2013

    • Author(s)
      S.-H. Kim, S.-i. Nam, A. Hosaka and H.-C. Kim
    • Journal Title

      Phys. Rev. D

      Volume: 88 Pages: 054012

    • Peer Reviewed
  • [Journal Article] Gluon Propagators in Maximally Abelian Gauge in SU(3) Lattice QCD2013

    • Author(s)
      S. Gongyo and H. Suganuma
    • Journal Title

      Phys. Rev. D

      Volume: 87 Pages: 074506:1-12

    • Peer Reviewed
  • [Journal Article] Quark Tensor Charge and Electric Dipole Moment within the Schwinger-Dyson Formalism2013

    • Author(s)
      N.Yamanaka, T.M. Doi, S. Imai and H. Suganuma
    • Journal Title

      Phys. Rev. D

      Volume: 88 Pages: 074036:1-14

    • Peer Reviewed
  • [Journal Article] X(3872) as a hybrid state of charmonium and the hadronic molecule2013

    • Author(s)
      Makoto Takizawa and Sachiko Takeuchi
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 093D01 Pages: 1-18

    • Peer Reviewed
  • [Journal Article] Parity doubling structure of nucleon at non-zero density in the holographic mean field theory2013

    • Author(s)
      Bing-Ran He, Masayasu Harada
    • Journal Title

      Phys.Rev. D

      Volume: 88 Pages: 095007:1-9

    • Peer Reviewed
  • [Journal Article] Dense Baryonic Matter in Hidden Local Symmetry Approach: Half-Skyrmions and Nucleon Mass2013

    • Author(s)
      Yong-Liang Ma, Masayasu Harada, Hyun Kyu Lee, Yongseok Oh, Byung-Yoon Park and Mannque Rho
    • Journal Title

      Physical Review D

      Volume: 88 Pages: 014016:1-12

    • Peer Reviewed
  • [Journal Article] Spin degeneracy in multi-hadron systems with a heavy quark2013

    • Author(s)
      S. Yasui, K. Sudoh, Y. Yamaguchi, S. Ohkoda, A. Hosaka and T. Hyodo
    • Journal Title

      Phys. Lett.

      Volume: 727 Pages: 185

    • DOI

      10.1016/j.physletb.2013.10.019

    • Peer Reviewed
  • [Journal Article] The isospin mixing in the X(3872) decay spectrum2013

    • Author(s)
      Sachiko Takeuchi , Makoto Takizawa, and Kiyotaka Shimizu
    • Journal Title

      Few Body Syst.

      Volume: 10.1007/s00601-013-0784-0 Pages: 1-5

    • Peer Reviewed
  • [Journal Article] Chiral partner structure of heavy baryons from the bound state approach with hidden local symmetry2013

    • Author(s)
      Masayasu Harada and Yong-Liang Ma
    • Journal Title

      Physical Review D

      Volume: 87 Pages: 056007:1-9

    • DOI

      10.1103/PhysRevD.87.056007

    • Peer Reviewed
  • [Journal Article] Skyrmions with vector mesons in the hidden local symmetry approach2013

    • Author(s)
      Yong-Liang Ma, Ghil-Seok Yang, Yongseok Oh, Masayasu Harada
    • Journal Title

      Physical Review D

      Volume: 87 Pages: 034023:1-17

    • DOI

      10.1103/PhysRevD.87.034023

    • Peer Reviewed
  • [Journal Article] Production of doubly charmed tetraquarks with exotic color configurations in electron-positron collisions2013

    • Author(s)
      Yong-Liang Ma, Masayasu Harada, Hyun Kyu Lee, Yongseok Oh, Byung-Yoon Park and Mannque Rho
    • Journal Title

      Physics Letters B

      Volume: 721 Pages: 56-60

    • DOI

      10.1016/j.physletb.2013.02.045

    • Peer Reviewed
  • [Journal Article] Heavy quark dynamics for charm and bottom flavor on Fermi surface at zero temperature2013

    • Author(s)
      S. Yasui and K. Sudoh
    • Journal Title

      Physical Review C

      Volume: 88 Pages: 015201-1-12

    • DOI

      10.1103/PhysRevC.88.015201

    • Peer Reviewed
  • [Presentation] Structure of charmed baryons and their productions studied at JPARC2014

    • Author(s)
      Atsushi Hosaka
    • Organizer
      The 3rd Korea-Japan Workshop on Nuclear and Hadron Physics at J-PARC
    • Place of Presentation
      Incheon, Korea
    • Year and Date
      20140320-21
  • [Presentation] Exotic Hadrons with heavy quarks2014

    • Author(s)
      Atsushi Hosaka
    • Organizer
      Workshop on QCD
    • Place of Presentation
      Hirscheg, Austria
    • Year and Date
      20140113-17
  • [Presentation] Hadrons with heavy quarks2013

    • Author(s)
      Atsushi Hosaka
    • Organizer
      FJNSP-LIA worksho
    • Place of Presentation
      Paris, France
    • Year and Date
      20130930-20131003
    • Invited
  • [Presentation] Analytical Relation between Confinement and Chiral Symmetry Breaking in terms of Polyakov Loop and Dirac Eigenmodes in Odd-Number Lattice QCD2013

    • Author(s)
      Hideo Suganuma
    • Organizer
      QCD-TNT-III International Workshop on “From Quarks and Gluons to Hadronic Matter: A bridge too far?”
    • Place of Presentation
      ECT*, Trento, Italy
    • Year and Date
      20130902-20130906
    • Invited
  • [Presentation] Flavor structure of the light-quark sea in nucleons and possible J-PARC projects2013

    • Author(s)
      S. Kumano
    • Organizer
      Workshop on Flavor Structure of the Nucleon Sea July 1 - 5, 2013
    • Place of Presentation
      ECT*, Trento, Italy
    • Year and Date
      20130701-20130705
    • Invited
  • [Presentation] Photoproduction of φ(ss) meson2013

    • Author(s)
      Atsushi Hosaka
    • Organizer
      Nstar worksho
    • Place of Presentation
      Peniscola, Valencia, Spain
    • Year and Date
      20130527-20130530
    • Invited
  • [Presentation] New Approaches to In-medium spectral function -- Holographic Mean-Field Theory for Baryon Many-Body Systems --2013

    • Author(s)
      M. Harada
    • Organizer
      Electromagnetic Probes of Strongly Interacting Matter: Status and Future of Low-Mass Lepton-Pair Spectroscopy
    • Place of Presentation
      ECT*, Trento, Italy
    • Year and Date
      20130520-20130524
    • Invited
  • [Presentation] Hadronic molecules with heavy quarks2013

    • Author(s)
      Atsushi Hosaka
    • Organizer
      Baikal workshop
    • Place of Presentation
      Baikal, Russia
    • Year and Date
      20130517-20130519
    • Invited
  • [Presentation] Holographic Mean-Field Theory for Baryon Many-Body Systems2013

    • Author(s)
      M. Harada
    • Organizer
      4th Year of APCTP-WCU Focus program ``From dense matter to compact stars in QCD and in hQCD
    • Place of Presentation
      APCTP, Pohang, Korea
    • Year and Date
      20130414-20140424
    • Invited

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Published: 2015-05-28  

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