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Systematic study of restoration of broken chiral symmetry

Research Project

Project/Area Number 21H01102
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

Aoki Kazuya  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (70525328)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2023: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2022: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2021: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
Keywordsカイラル対称性の自発的破れ / カイラル対称性 / ベクトル中間子 / 質量
Outline of Research at the Start

ハドロンの質量の大部分は、基底状態である真空が自発的にカイラル対称性を破ることにより獲得されると考えられている。本研究では原子核という高密度環境を利用して真空を変化させ、それにともなうハドロン質量を測定することで、ハドロン質量獲得機構を実験的に研究する。本研究は原子核標的サイズ依存性、ベクトル中間子の運動量依存性に加えて、衝突径数依存性をとらえることでより系統的な研究を行おうとするものである。

Outline of Final Research Achievements

We proposed J-PARC E16 experiment to study the origin of hadron mass. For that purpose we need Silicon Tracking System (STS) and GEM tracker (GTR). In this study we have developed STS with the CBM experiment team at GSI, Germany. We have prepared a prototype STS and evaluated its performance and learned about its characteristics and operations using electron beam. We have designed and built STS chamber and installed the silicon sensor into the chamber. We have evaluated the performance of the STS chamber and confirmed that the performance satisfied our needs. We have installed the chamber into the experimental area. We have also built and installed GTRs. We have performed commission run using proton beams with the highest design intensity. We are analyzing the data.

Academic Significance and Societal Importance of the Research Achievements

ハドロン質量の起源としてのカイラル対称性の自発的破れは、ハドロン物理の基本的な問題であり実験的検証がなされることは学術的意義が大きい。本研究費によって最内層シリコン検出器が完成してインストールでき、設計の最高機輝度ビーム下での動作確認ができた。また、その周囲を囲むGEM飛跡検出器についてもアクセプタンス増強を行うことができた。この実験の物理実験の採択を得るためには検出器の性能を示す必要があり、その為のデータを取得できことは、大きな一歩である。今後解析を行って検出器の性能を示し、物理実験の採択を得る。

Report

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

    (17 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (5 results) Journal Article (8 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Int'l Joint Research] GSI/フランクフルト大(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ワルシャワ工科大学(ポーランド)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] GSI/フランクフルト大学(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ワルシャワ工科大学(ポーランド)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] GSI(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Construction of gas electron multiplier tracker for the J-PARC E16 experiment2024

    • Author(s)
      Murakami T.N.、Aoki K.、Ashikaga S.、En’yo H.、Gunji T.、Hamagaki H.、Ichikawa M.、Kanno K.、Kobayashi S.、Komatsu Y.、Kondo T.K.、Morino Y.、Murakami H.、Muto R.、Nakai W.、Nakasuga S. et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 1058 Pages: 168817-168817

    • DOI

      10.1016/j.nima.2023.168817

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Commissioning of a hadron blind detector for dielectron measurement in pA reactions at J-PARC2023

    • Author(s)
      Kanno K.、Aoki K.、Arimizu D.、Ashikaga S.、Ebata K.、Honda R.、Ichikawa M.、Kajikawa S.、Kimura Y.、Kondo T.K.、Kyan S.、Morino Y.、Murakami H.、Murakami T.N.、Nakai W.、Nakasuga S. et al.
    • Journal Title

      Journal of Instrumentation

      Volume: 18 Issue: 06 Pages: C06021-C06021

    • DOI

      10.1088/1748-0221/18/06/c06021

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental Study of In-medium Spectral Change of Vector Mesons at J-PARC2023

    • Author(s)
      Aoki Kazuya、Arimizu Daichi、Ashikaga Sakiko、Chang Wen-Chen、Chujo Tatsuya、Ebata Kengo、En’yo Hideto、Esumi Shinichi、Hamagaki Hideki、Honda Ryotaro、Ichikawa Masaya、Kajikawa Shunsuke、Kanno Koki、Kimura Yuta、Kiyomichi Akio、Kondo Takehito K.、Kyan Shono、Lin Che-Sheng、Lin Chih-Hsun、Nakasuga Satomi et al.
    • Journal Title

      Few-Body Systems

      Volume: 64 Issue: 3 Pages: 63-63

    • DOI

      10.1007/s00601-023-01828-7

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Disentangling longitudinal and transverse modes of the φ meson through dilepton and kaon decays2023

    • Author(s)
      I.W. Park, H. Sako, K. Aoki, P. Gubler and S.H. Lee
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 7 Pages: 074033-074033

    • DOI

      10.1103/physrevd.107.074033

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Commissioning Runs of J-PARC E16 Experiment2023

    • Author(s)
      M.Ichikawa,..,Y.Morino,et,al
    • Journal Title

      Acta Phys.Polon.Supp

      Volume: 16 Issue: 1 Pages: 1-1

    • DOI

      10.5506/aphyspolbsupp.16.1-a143

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Commissioning of the electron identification system for Dilepton measurement in pA collisions at J-PARC2022

    • Author(s)
      S. Nakasuga, M. Ichikawa, M. Naruki, H. Sako, S. Sato, et al.,
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 1041 Pages: 167335-167335

    • DOI

      10.1016/j.nima.2022.167335

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Towards the Measurement of the Mass Modifications of Vector Mesons in a Finite Density Matter2022

    • Author(s)
      K. Ozawa, K. Ebata, M. Ichikawa, S. Nakasuga, M. Naruki, H. Sako, S. Sato, et al,
    • Journal Title

      Acta Physica Polonica A

      Volume: 142 Issue: 3 Pages: 399-404

    • DOI

      10.12693/aphyspola.142.399

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Data Acquisition System in the First Commissioning Run of the J-PARC E16 Experiment2021

    • Author(s)
      T.N. Takahashi 他28名
    • Journal Title

      IEEE Transactions on Nuclear Science

      Volume: 68 Issue: 8 Pages: 1907-1911

    • DOI

      10.1109/tns.2021.3087635

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Experimental study of in-medium spectral change of vector mesons and its polarization dependence at J-PARC2024

    • Author(s)
      K. Aoki
    • Organizer
      ExHIC-p workshop on polarization phenomena in nuclear collisions
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Experimental study of in-medium spectral change of vector mesons at J-PARC2022

    • Author(s)
      K. Aoki
    • Organizer
      Reimei Workshop: Polarization phenomena and Lorentz symmetry violation in dense matter
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Experimental study of in-medium spectral change of vector mesons in nuclear medium at J-PARC2022

    • Author(s)
      K. Aoki
    • Organizer
      Baryons 2022 (The 2022 International Conference on the Structure of Baryons)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Experimental investigation of in-medium spectral change of vector mesons at J-PARC2022

    • Author(s)
      K. Aoki
    • Organizer
      J-PARC ハドロン研究会 2022
    • Related Report
      2022 Annual Research Report

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

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