Hadron interactions in heavy hadron nuclei

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14478
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Nagoya University (2022-2023); Japan Atomic Energy Agency (2020-2021)
• Principal Investigator: Yamaguchi Yasuhiro 名古屋大学, 理学研究科, 助教 (00733932)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: エキゾチックハドロン / ハドロン相互作用 / ヘビークォーク

Outline of Final Research Achievements

In this study, we have been researching exotic hadrons appearing in the heavy quark region. Unlike previous studies on nuclear forces, Yukawa's prediction of pion exchange force playing an important role in attraction generation has been anticipated in hadron-hadron interactions. However, in this study, it was found that this alone is insufficient for bound-state formation in exotic hadrons. To explain the diverse spectra reported in experiments, short-range attractions are necessary, suggesting the importance of effects due to sigma exchange and coupling to core states. It is necessary to further understand hadron interactions to understand hadron molecular states that are dynamically formed near the threshold.

Free Research Field

ハドロン物理

Academic Significance and Societal Importance of the Research Achievements

我々の体や身の回りの物質の主な成分は原子核であり、それはハドロン多体系である。しかし、ハドロン間相互作用には未知の部分がまだ多くあり、我々は未だ自分自身の身体の形成機構を理解していない。本研究では近年加速器実験で報告されてきたエキゾチックハドロンを対象とし、原子核を超えた新たなハドロン束縛系を調べることで更なるハドロン相互作用の理解を目指した。ハドロン間相互作用の理解はそれ自身のみならず、素粒子クォークからどのようにハドロンが形成されるかという問題とも密接に関係し、物質形成の真理に迫るために必要不可欠である。