Symmetry effects in finite densities as reflected in mesic-nuclei

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03536
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Nara Women's University
• Principal Investigator: Nagahiro Hideko 奈良女子大学, 自然科学系, 准教授 (10397838)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ハドロン / 中間子原子核 / 対称性

Outline of Final Research Achievements

The aim of this study is to understand the mass spectra of hadron in terms of QCD symmetries. For this purpose, we focus the formation of the eta and eta' mesic nuclei. These mesons have the same quantum number and they mix in the physical states. However, they are expected to be affected by partial restoration of chiral symmetry by different mechanisms. To this end, this study is carried out on the systems of eta and eta-prime and nucleon using the coupled channel approach. We identify baryon resonances which are dynamically generated by eta-prime-N potential and study their effects for the eta-prime-N system. We also evaluate the decay process of the mesic nuclei system.

Free Research Field

ハドロン物理学

Academic Significance and Societal Importance of the Research Achievements

本研究により、ハドロンの質量生成について密度という異なる軸から観測をすることが出来る。これにより真空中のハドロンの性質を見るだけでは明らかにならなかった質量と対称性の関係を明らかにすることが出来ると考える。本研究はこれらの実験的な観測にむけ不可欠な理論的予言や、よりよい実験条件の特定、観測結果の理論的解釈を与えることが期待される。