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Lattice QCD study of diquark interactions and its applications to the excitation spectrum of Lambda_c baryon

Research Project

Project/Area Number 21K03535
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 InstitutionOsaka University

Principal Investigator

Ishii Noriyoshi  大阪大学, 核物理研究センター, 准教授 (40360490)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords量子色力学 / lattice QCD / チャームクォーク / ダイクォーク / チャームバリオン / 閉じ込めポテンシャル / ハドロン物理 / 格子QCD / ハドロン構造 / シュレディンガー方程式 / 構成クォーク模型 / クォーク・反クォークポテンシャル / バリオン / ポテンシャル
Outline of Research at the Start

ハドロン構造論で新しい有効自由度としてダイクォークに注目が集まっている。この研究ではダイクォークの性質(相互作用や質量)を格子QCD第一原理計算に基づいて解明する方法を提案し、実際に格子QCD計算を用いてこれらを求める。ダイクォークが構造を持つ複合粒子である。このため、ダイクォーク・クォーク間ポテンシャルの近距離部分の振る舞いはあまりはっきり理解されていないため、この部分に注目して研究を進める。ここで得られた結果を用いて、J-PARC実験等で関心が高まっているLambda_cバリオンの励起スペクトルを研究する。

Outline of Final Research Achievements

In order to understand the internal structure of hadrons such as protons and neutrons, an important role is expected to be played by diquarks, which consist of two quarks. However, due to the color confinement, one of the most important propergy of quantum chromodynamics (QCD), it is impossible to isolate a diquark. As a result, there exist no established ways to investigate various properties of diquarks such as mass, size, etc. both by experimental and theoretical approaches. The aim of this research is to propose and implement a method to quantitatively calculate the diquark mass using lattice QCD first-principles calculations with fully respecting
the problem of color confinement.

Academic Significance and Societal Importance of the Research Achievements

量子色力学のカラー閉じ込めに矛盾しない形で、クォーク2個からなるダイクォークの質量を始めとする様々な性質を定量的に調べる方法を定式化することは、ハドロン物理学において難問の一つである。今回の研究で行った提案は、この問題に対する一つの解答を与える。

Report

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

    (9 results)

All 2024 2023 2022 2021

All Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Presentation] Gauge dependence of ccbar potential from Nambu-Bethe-Salpeter wave function in Lattice QCD (II)2024

    • Author(s)
      張天宸, 石井理修
    • Organizer
      日本物理学会 2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Diquark mass and diquark - static quark potential from Lattice QCD2024

    • Author(s)
      Kai Wen Kelvin Lee, Noriyoshi Ishii
    • Organizer
      日本物理学会 2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Charm-bad-diquark potentials for Σc from NBS wave function in Lattice QCD (II)2024

    • Author(s)
      西岡蒼矢, 石井理修
    • Organizer
      日本物理学会 2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Diquark mass and quark-diquark potential of the axial-vector diquark in Sigma_c from Lattice QCD2023

    • Author(s)
      Soya Nishioka
    • Organizer
      International workshop on J-PARC hadron physics 2023 (J-PARC Hadron 2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mass and potential of diquarks from Lattice QCD2023

    • Author(s)
      Noriyoshi Ishii
    • Organizer
      Third International Workshop on the Extension Project for the J-PARC Hadron Experimental Facility (3rd J-PARC HEF-ex WS)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Gauge dependence of ccbar potential from Nambu-Bethe-Salpeter wave function in Lattice QCD2023

    • Author(s)
      張天宸, 石井理修
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] charm-bad-diquark potentials for Sigmac from NBS wave function in Lattice QCD2023

    • Author(s)
      西岡蒼矢, 石井理修
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Diquark mass and quark-diquark potential from LQCD2022

    • Author(s)
      Noriyoshi Ishii
    • Organizer
      Second International Workshop on the Extension Project for the J-PARC Hadron Experimental Facility (2nd J-PARC HEF-ex WS)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The qqbar potential from Wilson loop and the qqbar potential from NBS wave function2021

    • Author(s)
      Noriyoshi Ishii
    • Organizer
      LATTICE21(The 38th International Symposium on Lattice Field Theory)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

URL: 

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

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