ヘビークォークバリオンのスペクトルと相互作用

• Project Area: Quest on new hadrons with variety of flavors
• Project/Area Number: 22105503
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: 岡 真 東京工業大学, 理工学研究科, 教授 (60144606)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: ハドロン / 量子色力学 / ヘビークォーク / エキゾティックハドロン / ダイバリオン / 強い相互作用 / クォーク / グルーオン / QCD和則 / 格子QCD / クォーク模型

Research Abstract

ヘビークォークを含むハドロンの相互作用を、有効相互作用として構築し、これをもとにダイバリオンを中心とするハドロン分子束縛構造の解明を行った。強い相互作用の基礎理論である量子色力学（ＱＣＤ）におけるヘビークォークのダイナミクスは、いくつかの軽いクォーク系には見られない顕著な特長を表す。特に、ヘビークォークスピン対称性によって生じる縮退の結果、ハドロン間力におけるチャネル結合が強く働く構造に着目した。具体的にチャームバリオンΛcと核子Ｎの束縛状態やΛcΛcの束縛状態は、励起状態であるΣcおよびΣ*cとのテンソル結合により、引力が強く働いてできることが明らかになった。さらに短距離力の影響をクォーク模型に基づいて検討し、短距離での斥力が核子間の斥力に比べて弱いことを示した。また、チャーモニウムと原子核の相互作用を格子ＱＣＤのデータに基づいて解析し、核子数が４以上の原子核で、チャーモニウムが束縛する可能性が高いことを示した。これらの状態は、Ｊ-ＰＡＲＣ等のハドロン生成加速器において、実験的に探索が行われることが想定される。
ヘビークォークの物理を中心とするワークショップを開催するなどして、加速器でチャームバリオンを生成し、そのスペクトルを観測するための理論的なサポートを行った。
これらのハドロン相互作用の微視的、定量的な研究として、格子ＱＣＤにおける3点関数計算を用いて、ヘビーバリオンとメソンの結合定数を評価する研究を進めた。手始めにＤおよびＤ*メソンの結合定数を求め、ヘビークォーク対称性やベクトルカレント保存との整合性をチェックした。
チャームクォークを２個含むエキゾティックハドロンを電子陽電子衝突型実験において生成する断面積の計算を行った。ここではＮＲＱＣＤの定式化に基づく因子化を用いた摂動論的な計算を行い、生成されたメソンのカラー構造から来る断面積の変化に注目した。

Current Status of Research Progress

Reason

24年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

24年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Parity projection of QCD sum rules for the nucleon (2013)
  • Author(s): Keisuke Ohtani
  • Journal Title: Phys. Rev. Volume: D87 Issue: 3 Pages: 0340271-17
  • DOI: 10.1103/physrevd.87.034027
  • Peer Reviewed
• [Journal Article] Production of doubly charmed tetraquarks with exotic color configurations in electron-positron collisions (2013)
  • 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 Issue: 1-3 Pages: 56-60
  • DOI: 10.1016/j.physletb.2013.02.045
  • Peer Reviewed
• [Journal Article] Vector and axial-vector couplings of D and D* mesons in 2+1 flavor Lattice QCD (2013)
  • Author(s): K.U. Can
  • Journal Title: Phys. Lett. Volume: B719 Issue: 1-3 Pages: 103-109
  • DOI: 10.1016/j.physletb.2012.12.050
  • Peer Reviewed
• [Journal Article] Thermal modification of bottomonium spectra from QCD sum rules with the maximum entropy method (2013)
  • Author(s): Kei Suzuki
  • Journal Title: Nucl. Phys. Volume: A897 Pages: 28-41
  • DOI: 10.1016/j.nuclphysa.2012.09.011
  • Peer Reviewed
• [Journal Article] Lambda_c N bound states revisited (2012)
  • Author(s): Yan-Rui Liu
  • Journal Title: Phys. Rev. Volume: D85 Issue: 1 Pages: 0140151-22
  • DOI: 10.1103/physrevd.85.014015
  • Peer Reviewed
• [Journal Article] Meson-induced pentaquark productions (2012)
  • Author(s): Tetsuo Hyodo, Atsushi Hosaka, Makoto Oka
  • Journal Title: Prog.Theor.Phys. Volume: 128 Issue: 3 Pages: 523-531
  • DOI: 10.1143/ptp.128.523
  • NAID: 110009517359
  • Peer Reviewed
• [Journal Article] Application of the Maximum Entropy Method to QCD sum rules (2012)
  • Author(s): M.Oka, P.Gubler
  • Journal Title: Journal of Physics : Conference Series Volume: 348 Pages: 0120061-5
  • DOI: 10.1088/1742-6596/348/1/012006
  • Peer Reviewed
• [Journal Article] Energy and width of a narrow I=1/2 DNN quasibound state (2012)
  • Author(s): M. Bayar
  • Journal Title: Phys. Rev. Volume: C86 Issue: 4 Pages: 0440041-16
  • DOI: 10.1103/physrevc.86.044004
  • Peer Reviewed
• [Journal Article] Origin of the short-range part of generalized two- and three-body nuclear force (2012)
  • Author(s): Makoto Oka
  • Journal Title: Nucl. Phys. Volume: A881 Pages: 6-13
  • DOI: 10.1016/j.nuclphysa.2012.01.007
  • Peer Reviewed
• [Journal Article] Charmonium spectrum at finite temperature from a Bayesian analysis of QCD sum rules (2012)
  • Author(s): Philipp Gubler
  • Journal Title: EPJ Web Conf. Volume: 20 Pages: 030011-7
  • DOI: 10.1051/epjconf/20122003001
  • Peer Reviewed
• [Journal Article] Possible molecular bound states: Lambda(c) N and Lambda(c) Lambda(c) (2012)
  • Author(s): Yan-rui Liu
  • Journal Title: EPJ Web Conf. Volume: 20 Pages: 010011-8
  • DOI: 10.1051/epjconf/20122001001
  • Peer Reviewed
• [Journal Article] A Bayesian analysis of the nucleonQCD sum rules (2011)
  • Author(s): K.Ohtani, P.Gubler, M.Oka
  • Journal Title: The European Physical Journal A Volume: 47 Issue: 9 Pages: 114-129
  • DOI: 10.1140/epja/i2011-11114-4
  • Peer Reviewed
• [Journal Article] Prospects of the hadron physics at J-PARC (2011)
  • Author(s): Makoto Oka
  • Journal Title: J. Phys. Conf. Ser. Volume: 302 Pages: 0120521-5
  • DOI: 10.1088/1742-6596/302/1/012052
  • Peer Reviewed
• [Journal Article] Lambda* hypernuclei with chiral dynamics (2011)
  • Author(s): Toshitaka Uchino
  • Journal Title: J.Phys.Conf.Ser. Volume: 302 Pages: 0120581-4
  • DOI: 10.1088/1742-6596/302/1/012058
  • Peer Reviewed
• [Journal Article] The Lambda* N interaction and two-body bound state based on chiral dynamics (2011)
  • Author(s): Toshitaka Uchino
  • Journal Title: Nucl. Phys. Volume: A868-869 Pages: 53-81
  • DOI: 10.1016/j.nuclphysa.2011.08.005
  • Peer Reviewed
• [Journal Article] Determination of the pi Sigma scattering lengths from the weak decays of Lambda_c (2011)
  • Author(s): Tetsuo Hyodo
  • Journal Title: Phys. Rev. Volume: C84 Issue: 3 Pages: 0352011-12
  • DOI: 10.1103/physrevc.84.035201
  • Peer Reviewed
• [Journal Article] Possible ΛcΛc molecular bound state (2011)
  • Author(s): Wakafumi Meguro, Yan-Rui Liu, Makoto Oka
  • Journal Title: Physics Letters Volume: B704 Issue: 5 Pages: 547-550
  • DOI: 10.1016/j.physletb.2011.09.088
  • Peer Reviewed
• [Journal Article] Charmonium spectra at finite temperature from QCD sum rules with the maximum entropy method (2011)
  • Author(s): P.Gubler, K.Morita, M.Oka
  • Journal Title: Physical Review Letters Volume: 107 Issue: 9 Pages: 0920031-4
  • DOI: 10.1103/physrevlett.107.092003
  • Peer Reviewed
• [Journal Article] Two novel methods in QCD sum rules. (2010)
  • Author(s): P.Gubler, M.Oka
  • Journal Title: AIP Conf.Proc. Volume: 1322 Pages: 241-249
• [Journal Article] Meson-baryon coupling constants in two-flavor lattice QCD. (2010)
  • Author(s): G.Erkol, M.Oka, T.T.Takahashi
  • Journal Title: AIP Conf.Proc. Volume: 1322 Pages: 478-482
• [Journal Article] A(1405) from lattice QCD. (2010)
  • Author(s): T.T.Takahashi, M.Oka
  • Journal Title: Prog.Theor.Phys. Volume: S186 Pages: 172-179
  • Peer Reviewed
• [Journal Article] S-wave πK Scattering Length in 2+1 Flavor Lattice QCD (2010)
  • Author(s): K.Sasaki, N.Ishizuka, T.Yamazaki, M.Oka
  • Journal Title: Prog.Theor.Phys. Volume: S186 Pages: 187-192
  • NAID: 110008143437
  • Peer Reviewed
• [Journal Article] Possible Quantum Numbers of Θ+(1540) in QCD Sum Rules. (2010)
  • Author(s): P.Gubler, D.Jido, T.Kojo, T.Nishikawa, M.Oka
  • Journal Title: Prog.Theor.Phys. Volume: S186 Pages: 193-198
  • NAID: 110008143438
  • Peer Reviewed
• [Journal Article] Λ^*N Bound State Based on Chiral Dynamics. (2010)
  • Author(s): T.Uchino, T.Hyodo, M.Oka
  • Journal Title: Prog.Theor.Phys. Volume: S186 Pages: 240-243
  • NAID: 110008143446
  • Peer Reviewed
• [Journal Article] DDbar production and their interactions. (2010)
  • Author(s): Y.-R.Liu, M.Oka, M.Takizawa, X.Liu, W.-Z.Deng, S.-L.Zhu
  • Journal Title: Phys.Rev. Volume: D82
  • Peer Reviewed
• [Journal Article] A Bayesian approach to QCD sum rules. (2010)
  • Author(s): P.Gubler, M.Oka
  • Journal Title: Prog.Theor.Phys. Volume: 124 Pages: 995-1018
  • NAID: 110008006434
  • Peer Reviewed
• [Journal Article] S=+1 pentaquarks in QCD sum rules. (2010)
  • Author(s): P.Gubler, D.Jido, T.Kojo, T.Nishikawa, M.Oka
  • Journal Title: Phys.Rev. Volume: D82
  • Peer Reviewed
• [Journal Article] Recent QCD results on the strange hadron systems. (2010)
  • Author(s): Makoto Oka
  • Journal Title: Int.J.Mod.Phys. Volume: E19 Pages: 2326-2334
  • Peer Reviewed
• [Journal Article] Pseudoscalar-Meson Octet-Baryon Coupling Constants from two-flavor Lattice QCD. (2010)
  • Author(s): T.T.Takahashi, G.Erkol, M.Oka
  • Journal Title: Nucl.Phys. Volume: A835 Pages: 346-349
  • Peer Reviewed
• [Presentation] Prospects of the Hadron Physics at J-PARC (2011)
  • Author(s): Makoto Oka
  • Organizer: International Symposium "Nanoscience and Quantum Physics 2011"
  • Place of Presentation: Tokyo, Japan(招待講演)
• [Presentation] Two novel methods in QCD sum rules (2010)
  • Author(s): Makoto Oka
  • Organizer: International Workshop on Chiral Symmetry in Hadrons and Nuclei
  • Place of Presentation: Valencia, Spain(招待講演)
• [Presentation] Possible bound state in the Λc N channel (2010)
  • Author(s): Yan-rui Liu, Makoto Oka
  • Organizer: International conference on the structure of baryons (BARYONS'10)
  • Place of Presentation: Osaka, Japan
• [Presentation] Possible molecular bound state of two charmed baryons (2010)
  • Author(s): Wakafumi Meguro, Yan-rui Liu, Makoto Oka
  • Organizer: International conference on the structure of baryons (BARYONS' 10)
  • Place of Presentation: Osaka, Japan
• [Presentation] A Bayesian Analysis of QCD Sum Rules (2010)
  • Author(s): Philipp Gubler, Makoto Oka
  • Organizer: International conference on the structure of baryons (BARYONS'10)
  • Place of Presentation: Osaka, Japan
• [Presentation] Lambda^* hypernuclei with chiral dynamics (2010)
  • Author(s): Toshitaka Uchino, Tetsuo Hyodo, Makoto Oka
  • Organizer: International conference on the structure of baryons (BARYONS' 10)
  • Place of Presentation: Osaka, Japan
• [Presentation] QCD和則による核物質中での核子スペクトル関数の解析
  • Author(s): 大谷圭介
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] QCD和則による有限温度クォーコニウムスペクトルに対する虚時間相関関数
  • Author(s): 鈴木渓
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] チャームバリオン励起状態とDN相互作用の応用
  • Author(s): 兵藤哲雄
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] 短距離斥力を含む Y_cN 2体束縛状態
  • Author(s): 前田沙織
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] チャーモニウムの軽い原子核への束縛状態
  • Author(s): 横田朗
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] 格子QCDを用いたD中間子のπ,ρ結合定数
  • Author(s): 高橋徹
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] 有効模型を用いた共鳴状態の複合性の解析
  • Author(s): 内野俊隆
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学
• [Presentation] Charm physics at J-PARC
  • Author(s): Makoto Oka
  • Organizer: KEK theory center workshop on Hadron physics with high-momentum hadron beams at J-PARC in 2013
  • Place of Presentation: KEK, 筑波
  • Invited
• [Presentation] Molecular bound states of charmed hadrons
  • Author(s): Makoto Oka
  • Organizer: International Conference on Hypernuclear and Strange Particle Physics
  • Place of Presentation: Barcelona, Spain
  • Invited
• [Presentation] Charmed Deuteron and Nuclei
  • Author(s): Makoto Oka
  • Organizer: Xth Quark Confinement and the Hadron Spectrum
  • Place of Presentation: Munchen, Germany
• [Presentation] Charmed Deuteron and Nuclei
  • Author(s): Makoto Oka
  • Organizer: THE 20th INTERNATIONAL IUPAP CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS
  • Place of Presentation: 福岡
• [Presentation] Key Roles of Strangeness in the Generalized Nuclear Force
  • Author(s): Makoto Oka
  • Organizer: ECT* Workshop on Strange Hadronic Matter
  • Place of Presentation: Trento, Italy
  • Invited
• [Presentation] Possibility of Bound Charmed Deuteron
  • Author(s): Makoto Oka
  • Organizer: Hadron Structure and Interactions in 2011
  • Place of Presentation: 大阪大学
  • Invited
• [Presentation] Application of the Maximum Entropy Method to QCD sum rules
  • Author(s): Makoto Oka
  • Organizer: IIIrd International Conference on Hadron Physics TROIA'11
  • Place of Presentation: Canakkale, Turkey
  • Invited
• [Presentation] 電子陽電子衝突におけるダブルチャームテトラクォークの生成断面積
  • Author(s): 安井繁弘
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] DNN bound state in a variational calculation
  • Author(s): 土手昭伸
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] チャーモニウム-核子間の散乱長とチャーモニウム-原子核の束縛エネルギーの関係
  • Author(s): 横田朗
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] 有限密度下におけるN*のQCD和則による解析
  • Author(s): 大谷圭介
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] 共鳴状態を取り扱う有効模型の構築
  • Author(s): 内野俊隆
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] αs高次項を含むQCD和則による有限温度クォーコニウムの解析
  • Author(s): 鈴木渓
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] Meson-induced pentaquark production
  • Author(s): 兵藤哲雄
  • Organizer: 日本物理学会
  • Place of Presentation: 京都
• [Presentation] Thermal modification of bottomonium spectral functions from QCD sum rules with the maximum entropy method
  • Author(s): Makoto Oka
  • Organizer: Chiral Dynamics 2012
  • Place of Presentation: Newport News, USA