Search for undiscovered hadron by lattice QCD

• Project/Area Number: 24540250
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of Tsukuba
• Principal Investigator: NAMEKAWA Yusuke 筑波大学, 計算科学研究センター, 研究員 (00377946)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 計算物理

Outline of Final Research Achievements

The smallest component of known material is a quark. But, a theory of quarks anticipates additional unknown materials. I investigated mass spectrum including charm quarks by numerical simulations.
This study shows that the baryon mass spectrum including one charm quark agrees with experiments. On the other hand, the Ξcc(3520) baryon mass which includes two charm quarks significantly deviates from the reported experimental value. It suggests the experimental value is not correct. The true value is predicted to be 100 MeV higher. In addition, spectrum of other undiscovered charmed baryon comprised of two and three charm quarks is predicted in 2% precision.

Research Products

• [Journal Article] Development of lattice QCD simulation code set “Bridge++” on accelerators (2014)
  • Author(s): S.Motoki, S.Aoki, T.Aoyama, K.Kanaya, H.Matsufuru, Y.Namekawa, H.Nemura, Y.Taniguchi, S.Ueda, N.Ukita
  • Journal Title: PCS Volume: 29 Pages: 1701-1710
  • DOI: 10.1016/j.procs.2014.05.155
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Development of an object oriented lattice QCD code 'Bridge++' (2014)
  • Author(s): S.Ueda, S.Aoki, T.Aoyama, K.Kanaya, H.Matsufuru, S.Motoki, Y.Namekawa, H.Nemura, Y.Taniguchi, N.Ukita
  • Journal Title: J.Phys.Conf.Ser. Volume: 523,012046 Pages: 1-8
  • DOI: 10.1088/1742-6596/523/1/012046
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Charmed baryons at the physical point in 2+1 flavor lattice QCD (2013)
  • Author(s): Y. Namekawa, S. Aoki, K.-I. Ishikawa, N. Ishizuka, K. Kanaya, Y. Kuramashi, M. Okawa, Y. Taniguchi, A. Ukawa, N. Ukita, and T. Yoshie
  • Journal Title: Phys. Rev. D Volume: 87, No.9, 094512 Issue: 9 Pages: 1-9
  • DOI: 10.1103/physrevd.87.094512
  • Peer Reviewed
• [Journal Article] Bridge++: an object-oriented C++ code for lattice simulations (2013)
  • Author(s): S.Ueda,S.Aoki,T.Aoyama,K.Kanaya,H.Matsufuru,S.Motoki,Y.Namekawa,H.Nemura,Y.Taniguchi,N.Ukita
  • Journal Title: PoS Volume: LATTICE2013,412 Pages: 1-7
  • Peer Reviewed
• [Journal Article] 1+1+1 Flavor QCD+QED Simulation at the Physical Point (2012)
  • Author(s): PACS-CS Collaboration: K.-I.Ishikawa, Y.Kuramashi, Y.Nakamura
  • Journal Title: Physical Review D Volume: 86 Issue: 3 Pages: 34507-34507
  • DOI: 10.1103/physrevd.86.034507
  • Peer Reviewed
• [Journal Article] Charmed baryon spectroscopy on the physical point in 2+1 flavor lattice QCD (2012)
  • Author(s): Y.Namekawa
  • Journal Title: PoS Volume: LATTICE2012,139
  • Peer Reviewed
• [Presentation] Heavy hadrons from lattice QCD (2014)
  • Author(s): Y.Namekawa
  • Organizer: Structure and productions of charmed baryons II
  • Place of Presentation: KEK Tokai campus, Ibaraki, Japan
  • Year and Date: 2014-08-07 – 2014-08-09
  • Invited
• [Presentation] 格子QCDによるヘビーハドロン (2014)
  • Author(s): 滑川 裕介
  • Organizer: ヘビークォークハドロンと原子核のスペクトルと構造
  • Place of Presentation: 高エネルギー加速器研究機構
  • Invited
• [Presentation] Charm quark physics from lattice QCD at the physical point (2013)
  • Author(s): Y.Namekawa
  • Organizer: Future Prospects of Hadron Physics at J-PARC and Large Scale Computational Physics
  • Place of Presentation: Ibaraki Quantum Beam Research Center
• [Presentation] Charm quark physics from lattice QCD (2012)
  • Author(s): Y.Namekawa
  • Organizer: International Workshop on heavy quark hadrons at J-PARC 2012
  • Place of Presentation: Tokyo Institute of Technology
  • Invited
• [Presentation] Charmed baryons from lattice QCD (2012)
  • Author(s): Y.Namekawa
  • Organizer: Hadron Structure and Interactions 2012
  • Place of Presentation: Osaka University
• [Presentation] Charmed baryon spectroscopy on the physical point in 2+1 flavor lattice QCD (2012)
  • Author(s): Y.Namekawa
  • Organizer: The 30th International Symposium on Lattice Field Theory
  • Place of Presentation: Cairns Convention Centre
• [Presentation] Charm quark system on the physical point in 2+1 flavor lattice QCD (2012)
  • Author(s): 滑川裕介
  • Organizer: 「素核宇宙融合」×「新ハドロン」クロスオーバー研究会
  • Place of Presentation: 名古屋大学
  • Invited
• [Presentation] 物理点における2＋1フレーバー格子フルQCDシミュレーションによるチャームバリオンの研究 (2012)
  • Author(s): 滑川裕介
  • Organizer: 日本物理学年会
  • Place of Presentation: 京都産業大学