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Measurement of strange mesons at very forward region of LHC proton-proton collisions

Research Project

Project/Area Number 20H01917
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 InstitutionNagoya University

Principal Investigator

Menjo Hiroaki  名古屋大学, 宇宙地球環境研究所, 助教 (10447849)

Co-Investigator(Kenkyū-buntansha) 伊藤 好孝  名古屋大学, 宇宙地球環境研究所, 教授 (50272521)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2020: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywords超高エネルギー宇宙線 / ハドロン相互作用 / LHC / ストレンジメソン / LHC加速器 / カロリーメータ
Outline of Research at the Start

高エネルギーハドロン相互作用の理解は、超高エネルギー宇宙線の観測結果の解釈に不可欠なものであり、LHC実験による測定データが待ち望まれている。我々はこれまでLHC加速器の最前方領域測定実験であるLHCf実験を進めてきており、π0測定などを成功させて相互作用研究に貢献してきた。本研究では、LHC陽子-陽子衝突でのη、K0s、Λ粒子測定をLHCf検出器で行うことによって、宇宙線観測で問題となっている地上ミューオン過剰問題を解決する可能性あるK中間子を代表とするストレンジメソンの高エネルギー衝突での生成メカニズムを解明する。

Outline of Final Research Achievements

An operation has been performed with proton-proton collisions at the center-of-mass collision energy of 13.6 TeV in September 2022. Thanks to upgrade of data-readout system and trigger logic, the data were collected more efficiently than that in the past operations, and 300 M event in total were obtained.
Including a 2015 operation data, we obtained results of differential production cross-section of eta meson. We found that QGSJET II model reproduced the result well. The eta/pi0 ratio showed mostly constant on the meson energy, and it indicate that a universal process produces such eta meson production.

Academic Significance and Societal Importance of the Research Achievements

本研究では世界で初めて高エネルギーハドロン衝突の超前方領域でのストレンジメソンの生成断面積測定を行った。その結果、少なくともη中間子は多くの相互作用モデルの予想よりも少ない生成断面積であることがわかった。このことは、既存の相互作用モデルの改良が必要であり、これまでの空気シャワー発達シミュレーションの結果が変わることを意味する。これによって超高エネルギー宇宙線観測の観測結果、特に化学組成の測定結果の解釈に影響を与えると考えられる。これを通して、超高エネルギー宇宙線の加速源の解明に繋がっていくことが期待される。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (18 results)

All 2023 2022 Other

All Int'l Joint Research (3 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 9 results,  Invited: 4 results) Remarks (1 results)

  • [Int'l Joint Research] INFN Florence/INFN Catania(イタリア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] INFN Florence/INFN Catania(イタリア)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] INFN Florence/INFN Catania(イタリア)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Status of the LHCf experiment2023

    • Author(s)
      Ohashi Ken, et al.
    • Journal Title

      EPJ Web of Conferences

      Volume: 283 Pages: 05002-05002

    • DOI

      10.1051/epjconf/202328305002

    • Related Report
      2022 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Presentation] 最高エネルギー観測に期待すること2023

    • Author(s)
      毛受弘彰
    • Organizer
      研究会:次世代の最高エネルギー宇宙線観測の実現へ向けて、大阪電気電通大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Performances of hadronic shower measurement at a joint operation of LHCf and ATLAS ZDC detectors2023

    • Author(s)
      H. Menjo for the LHCf collaboration and ATLAS ZDC group
    • Organizer
      ICRC 2023, Nagoya, Japan
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Very forward particle measurements with LHCf and RHICf2022

    • Author(s)
      H. Menjo for LHCf and RHICf collaborations
    • Organizer
      21st International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2022)
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] LHCf and Atm. Neutrino flux2022

    • Author(s)
      H. Menjo for LHCf collaboration
    • Organizer
      2022年度新学術領域「ニュートリノで拓く素粒子と宇宙」研究会
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Very forward strange hadron measurement at LHC2022

    • Author(s)
      H. Menjo for LHCf collaboration
    • Organizer
      3rd Workshop for Atmospheric Neutrino Production in the MeV to PeV range (WANP2022)
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Status of the LHCf experiment2022

    • Author(s)
      K. Ohashi for LHCf collaboration
    • Organizer
      6th International Symposium on Ultra High Energy Cosmic-Rays (UHECR 2022)
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Performance evaluation of LHCf-ATLAS ZDC joint measurement using proton beam2022

    • Author(s)
      M. Kondo for LHCf collaboration
    • Organizer
      6th International Symposium on Ultra High Energy Cosmic-Rays (UHECR 2022)
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Prospects of the LHCf operation in 20222022

    • Author(s)
      K. Ohashi for LHCf collaboration
    • Organizer
      10th Edition of the Large Hadron Collider Physics Conference (LHCP 2022)
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LHCf: Very forward measurement at LHC2022

    • Author(s)
      H. Menjo for LHCf collaboration
    • Organizer
      2nd International Workshop on Forward Physics and Forward Calorimeter Upgrade in ALICE
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Recent results and Prospects of LHCf and RHICf2022

    • Author(s)
      H. Menjo for LHCf and RHICf collaborations
    • Organizer
      The 5th KMI International Symposium (KMI2023)
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] LHCf/RHICfによるトランジション領域 における相互作用研究2022

    • Author(s)
      H. Menjo for LHCf and RHICf collaborations
    • Organizer
      第5回 空気シャワー観測による宇宙線の起源探索勉強会
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Presentation] LHCf実験による 2022年陽子陽子衝突測定報2022

    • Author(s)
      毛受弘彰 他LHCfコラボレーション
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Presentation] LHCf 2022年測定時の検出器のエネルギースケール較正2022

    • Author(s)
      北上悠河 他LHCfコラボレーション
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] 名古屋大学宇宙地球環境研究所CRグループ(LHCf/RHICf 実験)

    • URL

      https://www.isee.nagoya-u.ac.jp/CR/research/interactions/

    • Related Report
      2022 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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