The η -/sup> N interaction from a chiral effective model and η -/sup>-N bound stat

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• 作者：Shuntaro Sakai ; Daisuke Jido
• 关键词：η ′N system ; Chiral symmetry ; Linear sigma model
• 刊名：Hyperfine Interactions
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：234
• 期：1-3
• 页码：71-76
• 全文大小：250 KB
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• 作者单位：Shuntaro Sakai (1)
  Daisuke Jido (2)
  
  1. Department of Physics, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
  2. Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Nuclear Physics, Heavy Ions and Hadrons
  Atoms, Molecules, Clusters and Plasmas
  Condensed Matter
  Surfaces and Interfaces and Thin Films
  
• 出版者：Springer Netherlands
• ISSN：1572-9540

文摘

The η -/sup> mass reduction in the nuclear medium is expected owing to the degeneracy of the pseudoscalar-singlet and octet mesons in the restoration of the spontaneous chiral symmetry breaking. In this study, we investigate the η -/sup> N 2body interaction, which is the fundamental interaction of the in-medium η -/sup> properties, using the linear sigma model as a chiral effective model. The η -/sup> N interaction in the linear sigma model comes from the scalar meson exchange with U _A (1) symmetry effect and is found to be fairly strong attraction. The transition amplitude of η -/sup> N to the η N channel is relatively small compared to that of elastic channel. From the analysis of the η -/sup> N 2body system, we find a η -/sup> N bound state with the binding energy 12.3-3.3iMeV. We expect that this strongly attractive two body interaction leads to a deep and attractive optical potential. Keywords η -/sup> N system Chiral symmetry Linear sigma model