N(1535)S11 properties from eta-nucleon scattering length determined by using the photon beam

• Project Area: Clustering as a window on the hierarchical structure of quantum systems
• Project/Area Number: 19H05141
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Tohoku University
• Principal Investigator: 石川 貴嗣 東北大学, 電子光理学研究センター, 助教 (40400220)
• Project Period (FY): 2019-06-28 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000); Fiscal Year 2020: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: メソン・バリオン相互作用 / カイラル対

Outline of Research at the Start

核子Nのカイラルパートナーの候補とされる核子共鳴N(1535)S11の構造を調べるためには、S11と強くするηNチャンネルの低エネルギー散乱の情報が欠かせない。本研究では、ηメソンと中性子nの散乱の寄与を露わに含む最適な運動学で、重陽子d標的でのηメソン光生成反応の微分断面積を測定し、ηN散乱の散乱長を精密に決定する。これにより自由空間でのS11の構造の解明を目指す。

Outline of Annual Research Achievements

核子共鳴N*(1535)S11は核子Nのカイラルパートナーの候補とされるが、その構造についてはよくわかっていない。N*(1535) はηメソンとNに崩壊しやすいため、N*(1535)の性質を明らかにするには低エネルギーηN散乱の情報が欠かせない。本研究では、ηと中性子 (n) の散乱の寄与を露わに含む最適な運動学で、重陽子(d) 標的でのηメソン光生成反応の微分断面積を測定し、ηn 散乱の散乱長すなわちηN散乱の散乱長を精密に決定する。これにより自由空間でのN*(1535)の構造、カイラル凝縮に伴う質量増加なのか、ηとNのハドロンクラスターの分子状態なのか、の解明を目指す。
東北大学電子光理学研究センター ELPH の光子ビームラインで 電磁カロリメータ FOREST と前方スペクトロメータ BLC を使って、陽子 (p)を0°で検出した 940 MeV 程度の光子ビームでのγd→ηpn反応に対するηn不変質量に対する微分断面積を測定する。実験遂行により統計量を増やすとともに、データ解析を継続的に行った。水素標的におけるγp→ηpあるいはγp→π0p反応のイベントで BLC スペクトロメータの運動量の較正を行い、重水素標的データでのプリリミナリーなηn不変質量分布を得た。
その他にも中性メソンと核子の間の相互作用として、低エネルギーωp散乱パラメータ (散乱長と有効距離) を決定し、学術論文にまとめあげた。またγd→π0ηd反応イベントの解析でηd 系でのアイソスカラーなダイバリオンのピークを見出し、観測されたダイバリオンの質量と幅を決定するとともに、中間状態のスピンパリティを与えた。またその質量分布からηd散乱パラメータの導出を行った。これらについては、2 つの学術論文 (letter と full paper) を執筆中であり、近日中に投稿予定である。

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Experimental study of (p, 2p) reactions at 392 MeV on 12C, 16O, 40Ca and 208Pb nuclei leading to low-lying states of residual nuclei (2020)
  • Author(s): Tetsuo Noro, Takatsugu Ishikawa et al.
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2020 Issue: 9
  • DOI: 10.1093/ptep/ptaa109
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Differential cross sections, photon beam asymmetries, and spin density matrix elements of ω photoproduction off the proton at Eγ=1.3?2.4 GeV (2020)
  • Author(s): Muramatsu N. et al. LEPS2/BGOegg Collaboration
  • Journal Title: Physical Review C Volume: 102 Issue: 2 Pages: 025201-025201
  • DOI: 10.1103/physrevc.102.025201
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Search for η′ Bound Nuclei in the C12(γ,p) Reaction with Simultaneous Detection of Decay Products (2020)
  • Author(s): N.Tomida, N.Muramatsu, M.Niiyama, J.K.Ahn, W.C.Chang, J.Y.Chen, M.L.Chu, S.Date, T.Gogami, H.Goto, H.Hamano, T.Hashimoto, Q.H.He, K.Hicks, T.Hiraiwa, Y.Honda, T.Hotta, H.Ikuno, Y.Inoue, T.Ishikawa, I.Jaegle, J.M.Jo, Y.Kasamatsu, H.Katsuragawa, S.Kido, Y.Kon, T.Maruyama, (全63名）
  • Journal Title: Physical Review Letters Volume: 124 Issue: 20 Pages: 202501-202501
  • DOI: 10.1103/physrevlett.124.202501
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ωN scattering length from ω photoproduction on the proton near the reaction threshold (2020)
  • Author(s): Ishikawa T.、7番目
  • Journal Title: Physical Review C Volume: 101 Issue: 5 Pages: 052201-052201
  • DOI: 10.1103/physrevc.101.052201
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron (2020)
  • Author(s): Takatsugu Ishikawa et al.
  • Journal Title: EPJ Web of Conferences Volume: 241 Pages: 01007-01007
  • DOI: 10.1051/epjconf/202024101007
  • Peer Reviewed / Open Access
• [Journal Article] ωN scattering length from ω photoproduction on the proton near the threshold (2020)
  • Author(s): Takatsugu Ishikawa et al.
  • Journal Title: AIP Conference Proceedings Volume: 2249 Pages: 030027-030027
  • DOI: 10.1063/5.0008651
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ωN scattering length from ω photoproduction on the proton near the threshold (2020)
  • Author(s): T. Ishikawa et al.
  • Journal Title: AIP Conference Proceedings Volume: 2319 Pages: 080017-080017
  • DOI: 10.1063/5.0036979
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Neutron-neutron scattering length from π+ photoproduction on the deuteron (2020)
  • Author(s): S.X. Nakamura, T. Ishikawa, T. Sato
  • Journal Title: arXiv preprint Volume: nucl-th
  • Open Access / Int'l Joint Research
• [Journal Article] ηN Scattering Parameters and Possible η'd Bound State from η Photoproduction on the Deuteron (2020)
  • Author(s): T. Ishikawa et al.
  • Journal Title: Acta Physica Polonica B Volume: 51 Issue: 1 Pages: 27-32
  • DOI: 10.5506/aphyspolb.51.27
  • Peer Reviewed / Open Access
• [Journal Article] Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron (2020)
  • Author(s): T. Ishikawa et al.
  • Journal Title: Acta Physica Polonica B Volume: 51 Issue: 1 Pages: 329-332
  • DOI: 10.5506/aphyspolb.51.329
  • Peer Reviewed / Open Access
• [Journal Article] Performance of the FOREST/BLC Spectrometer for Study of the η-nucleon Interaction via the γd→pηn Reaction (2020)
  • Author(s): S. Miyata, T. Ishikawa et al.
  • Journal Title: Springer Proceedings in Physics Volume: 238 Pages: 705-708
  • DOI: 10.1007/978-3-030-32357-8_113
  • ISBN: 9783030323561, 9783030323578
  • Peer Reviewed
• [Journal Article] Study of Non-strange Dibaryon Resonances Via Coherent Double Neutral-Meson Photoproduction from the Deuteron (2020)
  • Author(s): T. Ishikawa et al.
  • Journal Title: Springer Proceedings in Physics Volume: 238 Pages: 609-613
  • DOI: 10.1007/978-3-030-32357-8_96
  • ISBN: 9783030323561, 9783030323578
  • Peer Reviewed
• [Journal Article] 最近の研究から「光子ビームで探るクォーク・グルーオン多体系―ダイバリオンの発見から分光へ」 (2020)
  • Author(s): 石川貴嗣、笠木治郎太
  • Journal Title: 日本物理学会誌 BUTSURI Volume: 75
  • Peer Reviewed
• [Journal Article] Measuring Space-Time Properties of the Δ(1232) via Bose-Einstein Correlations (2019)
  • Author(s): Qinghua He, Takatsugu Ishikawa et al.
  • Journal Title: JPS Conference Proceedings Volume: 26
  • DOI: 10.7566/jpscp.26.024004
  • Peer Reviewed / Open Access
• [Journal Article] Non-strange Dibaryon Resonances Observed in Coherent Double Neutral-Pion Photoproduction on the Deuteron (2019)
  • Author(s): Takatsugu Ishikawa et al.
  • Journal Title: JPS Conference Proceedings Volume: 26
  • DOI: 10.7566/jpscp.26.022014
  • Peer Reviewed / Open Access
• [Journal Article] Experimental Study of Di-quark Correlation by CharmedBaryon Spectroscopy at J-PARC High-Momentum Secondary Beam Line (2019)
  • Author(s): Y. Komatsu
  • Journal Title: JPS Conf. Proc. Volume: - Pages: 022029-022029
  • DOI: 10.7566/jpscp.26.022029
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] eta photoproduction off the deuteron and low-energy eta-nucleon interaction (2019)
  • Author(s): S.X. Nakamura, H. Kamano, T. Ishikawa
  • Journal Title: JPS Conference Proceedings Volume: 26 Pages: 0230011-4
  • DOI: 10.7566/jpscp.26.023001
  • Peer Reviewed / Open Access
• [Presentation] Coherent neutral pion and eta meson photoproduction on the deuteron (2021)
  • Author(s): Takatsugu Ishikawa
  • Organizer: Yamada Conference LXXII: The 8th Asia-Pacific conference on Few-Body problems in Physics (APFB2020)
  • Int'l Joint Research
• [Presentation] ηd threshold structure from the γd→π0ηd reaction (2021)
  • Author(s): Takatsugu Ishikawa
  • Organizer: Hadron in Nucleus 2020 (HIN20)
  • Int'l Joint Research
• [Presentation] Hadron physics from meson photoproduction experiments at ELPH (2021)
  • Author(s): Takatsugu Ishikawa
  • Organizer: 東京工業大学量子物理学ナノサイエンス第307 回セミナー
  • Invited
• [Presentation] nn scattering length from positive pion photoproduction on the deuteron (2021)
  • Author(s): Takatsugu Ishikawa
  • Organizer: 東京工業大学インフォーマルセミナー
  • Invited
• [Presentation] Low-energy neutron-neutron scattering studied with pion photoproduction on the deuteron (2021)
  • Author(s): Satoshi X Nakamura
  • Organizer: Hadron in Nucleus 2020 (HIN20)
  • Int'l Joint Research
• [Presentation] Hadron-hadron scattering length from meson photoproduction (2020)
  • Author(s): Takatsugu Ishikawa
  • Organizer: Joint THEIA-STRONG2020 and JAEA/Mainz REIMEI Web-Seminar
  • Invited
• [Presentation] Hadron-hadron scattering length from meson photoproduction (2020)
  • Author(s): 石川貴嗣
  • Organizer: ELPH workshop C029 “様々なフレーバー領域で探るクォーク・ハドロン多体系の分光と構造”
• [Presentation] 重水素標的におけるコヒーレントπ0η光生成反応によるηN散乱長の決定 (2020)
  • Author(s): 石川貴嗣
  • Organizer: 新学術領域研究「量子クラスターで読み解く物質の階層構造」 ワークショップ（第5回クラスター階層領域研究会）
• [Presentation] 仮想光子を使った nn 散乱長の精密測定による荷電対称性の破れの研究 (2020)
  • Author(s): 石川貴嗣
  • Organizer: 新学術領域研究「宇宙観測検出器と量子ビームの出会い。新たな応用への架け橋。」 ワークショップ（第2回領域全体会議）
• [Presentation] Determination of eta-nucleon scattering length from eta photoproduction on the deuteron (2020)
  • Author(s): 石川貴嗣
  • Organizer: 新学術領域研究「量子クラスターで読み解く物質の階層構造」 ワークショップ（第3回クラスター階層領域研究会）
• [Presentation] Neutron-neutron scattering length from π+ photoproduction on the deuteron (2020)
  • Author(s): 中村聡
  • Organizer: ELPH workshop C029 “様々なフレーバー領域で探るクォーク・ハドロン多体系の分光と構造”
  • Invited
• [Presentation] Photo-production of the eta-meson on the deuteron (2020)
  • Author(s): Takatsugu Ishikawa
  • Organizer: International Symposium on Clustering as a Window on the Hierarchical Structure of Quantum Systems (CLUSHIQ2020)
  • Int'l Joint Research
• [Presentation] Dibaryon photoproduction on the deuteron detecting two neutral pions and deuteron (2020)
  • Author(s): Takatsugu Ishikawa
  • Organizer: KEK/Tokai Internal workshop on “Physics of heavy-quark and exotic hadrons”
  • Int'l Joint Research / Invited
• [Presentation] Experimental study of a light exotic baryon with neutral meson photoproduction (2020)
  • Author(s): Yusuke Tsuchikawa
  • Organizer: KEK/Tokai Internal workshop on “Physics of heavy-quark and exotic hadrons”
  • Int'l Joint Research / Invited
• [Presentation] ωN scattering length from ω photoproduction on the proton near the threshold (2019)
  • Author(s): Takatsugu Ishikawa
  • Organizer: The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU2019
  • Int'l Joint Research
• [Presentation] Non-Strange Dibaryons studied in coherent double neutral-meson photoproduction on the deuteron (2019)
  • Author(s): Takatsugu Ishikawa
  • Organizer: The 12th Internal workshop on the Physics of Excited Nucleons (NSTAR2019)
  • Int'l Joint Research
• [Presentation] ηN scattering parameters and possible η'N bound state from η photoproduction on the deuteron (2019)
  • Author(s): Takatsugu Ishikawa
  • Organizer: 3rd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics
  • Int'l Joint Research / Invited
• [Presentation] Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron (2019)
  • Author(s): Takatsugu Ishikawa
  • Organizer: 3rd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics
  • Int'l Joint Research
• [Presentation] ωN scattering length from ω photoproduction on the proton near the threshold (2019)
  • Author(s): Takatsugu Ishikawa
  • Organizer: The 14th Asia-Pacific Physics Conference 2019 (APPC2019)
  • Int'l Joint Research
• [Presentation] Study of charge symmetry breaking from the precise and accurate measurement of the nn scattering length using virtual photons (2019)
  • Author(s): 石川 貴嗣
  • Organizer: 新学術領域研究「宇宙観測検出器と量子ビームの出会い。新たな応用への架け橋。」 ワークショップ（第1回領域全体会議）
• [Presentation] コヒーレントなダブルメソン光生成反応で探るダイバリオン共鳴, (2019)
  • Author(s): 石川 貴嗣
  • Organizer: ELPH workshop C024 “ハドロン構造における多粒子相関”
• [Presentation] Dynamical coupled-channels approach to electroweak reactions on nucleon and deuteron (2019)
  • Author(s): 中村 聡
  • Organizer: ELPH workshop C024 “ハドロン構造における多粒子相関”
  • Invited
• [Presentation] Dynamical coupled-channels approach to electroweak reactions on nucleon and deuteron (2019)
  • Author(s): Satoshi X Nakamura
  • Organizer: The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU2019
  • Int'l Joint Research / Invited
• [Remarks] 超前方荷電粒子検出で拓く物理
  • URL: http://www.lns.tohoku.ac.jp/hadron/mbr/ishikawa/j2020a.html
• [Remarks] 超前方荷電粒子検出で拓く物理
  • URL: http://www.lns.tohoku.ac.jp/hadron/mbr/ishikawa/j2019a.html