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Anti-quark structures of proton and neutron studied by the photoproduction of pi and Delta

Research Project

Project/Area Number 16K05379
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionNagoya University (2018)
Osaka University (2016-2017)

Principal Investigator

Kohri Hideki  名古屋大学, 理学研究科, 特任講師 (40448022)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords中間子 / 偏極 / フォトン / クォーク / 反クォーク / SPring-8 / 光生成 / 核子構造 / ハドロン / LEPS / 中間子生成 / フォトンビーム / バリオン / ビーム非対称度 / 断面積 / 光生成反応 / 核子励起 / 実験核物理 / 素粒子実験
Outline of Final Research Achievements

We carried out a meson production experiment by using linearly polarized photon beams with energies of 1.5-3 GeV at SPring-8/LEPS. We published two experimental results of (1) gamma p -> pi+ n and (2) gamma p -> K+ Lambda in Physical Review C. We also successfully published experimental results of (3) gamma p -> pi- Delta++ and (4) gamma p -> pi+ Delta0 in Physical Review Letters and Few-Body Systems, respectively.
We took data for the (5) gamma n -> pi+ Delta- and (6) gamma n -> pi- Delta+ reactions and confirmed that the data quality was good enough. However, the number of events was about 20% of the events needed for the publication of the results. We plan to continue data taking and publish the results in 2-3 years.

Academic Significance and Societal Importance of the Research Achievements

今回発表した中間子光生成反応では、①d-反dクォーク対、②s-反sクォーク対、③u-反uクォーク対、④d-反dクォーク対の生成を分離して研究する事ができる。これは初めての試みであり、高エネルギーフォトンによってどのようなメカニズムでハドロンが生成されるかを解明するために極めて重要な意義が有る。反応③と④の超前方角度断面積の比は、アイソスピンから予測される比とほぼ同じであり、ハドロン生成に関する理解を深める重要な結果になった。大きな角度での断面積は予測より大きな値であり、アイソスピン2の奇妙な粒子の交換か、核子の中の豊富な反dクォークが反応④を促進していると考えられる興味深い結果になった。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (13 results)

All 2018 2017 2016

All Journal Article (8 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Differential cross section and photon-beam asymmetry for the gamma p -> pi- Delta++(1232) reaction at forward pi- angles for Egamma=1.5-2.95 GeV2018

    • Author(s)
      H. Kohri et al. (LEPS collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 120 Issue: 20

    • DOI

      10.1103/physrevlett.120.202004

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Photoproduction of pi-Delta++, pi+Delta0, and pi+n on the proton at Egamma=1.5-3.0 GeV2018

    • Author(s)
      H. Kohri for LEPS collaboration
    • Journal Title

      Few-Body Systems

      Volume: 59 Pages: 88-88

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Photoproduction of pi-Delta++ and pi+Delta0 on the proton for the comparison of uubar and ddbar productions2018

    • Author(s)
      H. Kohri for LEPS collaboration
    • Journal Title

      Proceedings of Science

      Volume: Hadron2017 Pages: 66-66

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Journal Article] Differential cross sections and photon-beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV2018

    • Author(s)
      H. Kohri et al. (LEPS collaboration)
    • Journal Title

      Physical Review C

      Volume: 97 Issue: 1

    • DOI

      10.1103/physrevc.97.015205

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Photoproduction of Lambda and Sigma0 hyperons off protons with linearly polarized photons at Egamma=1.5-3.0 GeV2018

    • Author(s)
      S.H. Shiu, H. Kohri et al. (LEPS collaboration)
    • Journal Title

      Physical Review C

      Volume: 97 Issue: 1

    • DOI

      10.1103/physrevc.97.015208

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First measurement of coherent phi-meson photoproduction from 4He near threshold2018

    • Author(s)
      T. Hiraiwa et al. (LEPS collaboration)
    • Journal Title

      Physical Review C

      Volume: 97 Issue: 3

    • DOI

      10.1103/physrevc.97.035208

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] phi photoproduction on the proton at Egamma=1.5-2.9 GeV2017

    • Author(s)
      K. Mizutani et al. (LEPS collaboration)
    • Journal Title

      Physical Review C

      Volume: 96 Issue: 6

    • DOI

      10.1103/physrevc.96.062201

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Comparison between uubar and ddbar productions by the γp→π-Δ++ and π+Δ0 reactions at forward π angles at Eγ=1.5-3.0 GeV2017

    • Author(s)
      H. Kohri for LEPS collaboration
    • Journal Title

      Physics of Particles and Nuclei

      Volume: 48 Issue: 1 Pages: 6368-6368

    • DOI

      10.1134/s1063779617010129

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Recent results of pion and kaon photoproduction at SPring-8/LEPS2018

    • Author(s)
      H. Kohri
    • Organizer
      Electromagnetic Interactions of Nuclei (EMIN2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 静的核偏極を用いた固体HD分子標的2017

    • Author(s)
      郡 英輝
    • Organizer
      日本物理学会 年会
    • Place of Presentation
      大阪大学
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Photoproduction of pi-Delta++, pi+Delta0, and pi+n on the proton at Egamma=1.5-3.0 GeV2017

    • Author(s)
      H. Kohri
    • Organizer
      NSTAR2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Photoproduction of pi-Delta++ and pi+Delta0 on the proton for the comparison of uubar and ddbar productions2017

    • Author(s)
      H. Kohri
    • Organizer
      HADRON2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Photoproduction of π-Δ++ and π+Δ0 on the proton for comparing uubar and ddbar productions at LEPS/SPring-82016

    • Author(s)
      H. Kohri
    • Organizer
      Baryon2016
    • Place of Presentation
      Florida state university (USA)
    • Year and Date
      2016-05-16
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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