Positive and Negative-Parity Baryons in Coupled QCD Sum Rules(Pentaquarks and related topics, Exotic hadrons, New Frontiers in QCD-Exotic Hadrons and Hadronic Matter-)

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概要

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• We apply the method of the QCD sum rule, in which positive- and negative-parity baryons couple with each other, to the flavor-octet baryons and investigate the parity splittings. The obtained sum rules turn out to have a very good Borel stability and also have a Borel window. The predicted masses of the positive- and negative-parity baryons reproduce the experimental ones fairly well in the Λ and Σ channels, if we assign the Λ(1670) and the Σ(1620) to the parity partners of the Λ and the Σ, respectively. This implies that the Λ(1405) is not the party partner of the Λ and may be a flavor-singlet or exotic state. In the Ξ channel, the sum rule predicts the mass of the negative-parity state to be about 1.8 GeV, which leads to two possibilities ; one is that the observed state, Ξ(1690), is the parity partner and the other is that the parity partner is not yet found but exists around 1.8 GeV.

• 理論物理学刊行会の論文
• 2007-11-09

著者

• Nishikawa Tetsuo

  Department Of Endocrinology & Metabolism Yokohama Rosai Hospital

• Nishikawa Tetsuo

  Department Of Physics Tokyo Institute Of Technology

• Kondo Yoshihiko

  Kokugakuin University

• MORIMATSU Osamu

  Institute of Particle and Nuclear Study, High Energy Accelerator Research Organization

• Morimatsu Osamu

  Institute Of Particle And Nuclear Studies High Energy Accelerator Research Organization

• Morimatsu Osamu

  Institute For Nuclear Study University Of Tokyo

• NISHIKAWA Tetsuo

  Department of Physics, Tokyo Institute of Technology

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