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Symmetry effects in finite densities as reflected in mesic-nuclei

Research Project

Project/Area Number 21K03536
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionNara 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
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsハドロン / 中間子原子核 / 対称性 / 結合チャネル / 擬スカラー中間子 / eta'原子核 / ハドロン相互作用 / カイラル対称性
Outline of Research at the Start

ハドロンの性質を対称性を手がかりとして、統一的に理解することを最終的な目的とし、その一環として、ηおよびη'(958)中間子原子核束縛状態の実験的観測に向けた理論研究を行う。これらの中間子は同じ量子数を持つ基底状態とその励起状態であるが、それぞれ原子核中では、異なるメカニズムでカイラル対称性の自発的破れ、およびその部分的回復の効果を受けると考えられている。本研究はこれらの中間子原子核束縛系を生成し、包括的に議論することにより、有限媒質中におけるカイラル対称性回復のシグナルがどのように得られるのかを解明し、ハドロンの性質においてカイラル対称性の果たす役割について理解することを目指す。

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.

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。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2021

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Excitation spectra of heavy baryons in a quark-diquark model with relativistic corrections2023

    • Author(s)
      Kinutani S.、Nagahiro H.、Jido D.
    • Journal Title

      Physical Review D

      Volume: 108 Issue: 9 Pages: 094011-094011

    • DOI

      10.1103/physrevd.108.094011

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Understanding the nature of Omega(2012) in a coupled-channel approach2023

    • Author(s)
      Lyu Qi-Fang、Nagahiro Hideko、Hosaka Atsushi
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 1 Pages: 014025-014025

    • DOI

      10.1103/physrevd.107.014025

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chiral symmetry restoration at high matter density observed in pionic atoms2023

    • Author(s)
      Nishi Takahiro et. al
    • Journal Title

      Nature Physics

      Volume: 2023 Issue: 6 Pages: 1-8

    • DOI

      10.1038/s41567-023-02001-x

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Two-Pion Emission Decay of Roper-Like Heavy Baryons2021

    • Author(s)
      Arifi Ahmad Jafar、Nagahiro Hideko、Hosaka Atsushi、Tanida Kiyoshi
    • Journal Title

      Few-Body Systems

      Volume: 62 Issue: 3 Pages: 36-36

    • DOI

      10.1007/s00601-021-01625-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Internal structure of Ω(2012) baryon in a coupled-channel approach2023

    • Author(s)
      Hideko Nagahiro
    • Organizer
      6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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