An Analysis of ππ-Scatterubg Phase Shift and Existence of σ(555) Particle

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概要

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• In most of the Nambu-Jona-Lasinio(NJL)-type models, realizing the hidden chiral symmetry, the existence of a scalar particle σ is needed with a mass m_σ=2m_q, as a partner of the Nambu-Goldstone boson π. However, the results of many analyses on ππ phase-shift thus far made have been negative for its existence.In this paper we re-analyze the phase-shift, applying a new method, the interfering amplitude method, which treats the T-matrix directly and describes multi-resonances in conformity with the unitarity. As a result, the existence of σ has been strongly suggested from the bahavior of the ππ→ππ phase shift between the ππ- and the KK^^-- thresholds, with mass = 553,3±0.5_<st>MeV and width =242.6±1.2_<st>MeV. The most crucial point in our analysis is the introduction of a negative background phase, possibly refledting a "repulsive core" in ππ interactions. The properties of f_0(980) are also investigated from data including those over the KK^^- threshold. Its mass is obtained as 993.2±6.5_<st>±6.9_<sys>MeV. Its width is about a hundred MeV, although this depends largely on the treatment of the elasticity and the ππ → KK^^- phase shift, both of which may have large experimental uncertainties.

• 理論物理学刊行会の論文
• 1996-04-25

著者

• 鷹橋 浩幸

  Department of Pathology, The Jikei University School of Medicine

• 鷹橋 浩幸

  Dept. Pathol. Jikei Univ. Sch. Med.

• 鷹橋 浩幸

  麻布大学 獣医

• ISHIDA Shin

  Atomic Energy Research Institute, College of Science and Technology, Nihon University

• ISHIDA Muneyuki

  Department of Physics, Tokyo Institute of Technology

• ISHIDA Taku

  KEK

• TAKAMATSU Kunio

  KEK

• TSURU Tsuneaki

  KEK

• Takamatsu Kunio

  Department Of Physics Faculty Of Science Kyoto University

• Tsuru Tsuneaki

  National Laboratory For High Energy Physics

• Ishida Muneyuki

  Department Of Physics School Of Science And Engineering Meisei University

• Ishida S

  Research Institute Of Science And Technology College Of Science And Technology Nihon University

• Ishida M

  Tokyo Inst. Technol. Tokyo Jpn

• Takahashi H

  Safety Research Department Pharmaceuticals Development Research Laboratories

• TAKAHASHI Hiroyuki

  Safety Research Department, pharmaceuticals Development Research Laboratories

• TAKAHASHI Hiroyuki

  Atomic Energy Research Institute, College of Science and Technology Nihon University

• ISHIDA Taku

  Insititute for Cosmic Ray Research, University of Tokyo

• ISHIDA Taku

  National Laboratory for High Energy Physics(KEK)

• ISHIDA Taku

  Department of Engineering, Miyazaki University

• TSURU Tsuneaki

  Atomic Energy Research Institute College of Science and Technology, Nihon University

• Ishida Shin

  Atomic Energy Research Institute College Of Science And Technolgy Nihon University

• TAKAMATSU Kunio

  Department of Engineering, Miyazaki University

• ISHIDA Taku

  Insititute for Cosmic Ray Research, University of Tokyo:National Laboratory for High Energy Physics (KEK)

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