in-medium effect for hadrons and symmetries of QCD

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K05443
• 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: 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): 2017-04-01 – 2020-03-31
• Keywords: 中間原子核

Outline of Final Research Achievements

We investigate the formation of the eta-prime(958)-nucleus bound state to know the properties of the eta-prime meson. The eta-prime meson has a huge mass compared with other pseudo-scalar meson which is known as UA(1) anomaly.
We focus the in-medium change of the properties of the eta-prime meson and the interaction between eta-prime and nucleon and try to evaluate the effect of the partial restoration of chiral symmetry to the eta-prime system. We try to identify the possible coupled-channels to the eta-prime-nucleon system, which one can observe as a simultaneous observation at the formation of the eta-prime mesic nuclei to reduce the background in experiments.

Free Research Field

ハドロン理論

Academic Significance and Societal Importance of the Research Achievements

物質の質量の大部分を占めるハドロンの性質は、いまだ明らかになっていない部分が多い。特にハドロン質量の９０％は、その構成粒子であるクォーク由来ではなく、カイラル対称性の自発的破れに伴って生成されるとされているが、この実験的検証は未だ十分ではない。本研究を通して、ハドロンの質量生成機構について明らかにすることができると期待される。