Exclusive K<sup>+</sup>Λ and K<sup>+</sup>Σ<sup>0</sup> electroproduction at Q<sup>2</sup>≅0.5 (GeV/c)<sup>2</sup>

ORAL

Abstract

We measured the differential cross section for the p(e,e'K+)Λ/Σ0 reaction at Jefferson Lab in 2018 [1,2]. This dataset is at four-momentum transfer Q2≅0.5 (GeV/c)2 ,W≅2.14 GeV, θγKc.m.≅8 deg. This kinematic condition has never been covered by other experiments. In this talk, we will report the differential cross section for the extracted virtual photoproduction, p(γ*,K+)Λ/Σ0 reaction, to compare with the photoproduction.

The new results were compared with predictions of isobaric models which describe the hyperon production reaction with hadron degrees of freedom. In particular, BS models [3] developed by Bydžovský and Skoupil were optimized with extensive photoproduction experimental data reported by CLAS and LEPS in 2010 and 2006, respectively.The predictions of the hyperon elecetroproduction with the models were in good agreement with our new results. According to the BS models, the longitudinal couplings of the virtual photon had a significant contribution. This cannot be investigated by the photoproduction, but can be approached only by the electroproduction. Our new results can help to determine the magnitude of the longitudinal couplings at relatively high-Q2 region.

[1] B. Panday et al., PRC 105 (2022) L051001.

[2] K.N. Suzuki et al., PTEP 013D01 (2022).

[3] D. Skoupil and P. Bydžovský, PRC 93 (2016) 025204; PRC 97 (2018) 025202.

*This work was supported by U.S. DOE grant DE-AC05-06OR23177 under which Jefferson Science Associates, LLC, operates the Thomas Jefferson National Accelerator Facility. The hypernuclear program at JLab is supported by U.S. DOE grant DE-FG02-97ER41047. This work was supported by the Grant-in-Aid for Scientific Research on Innovative Areas "Toward new frontiers Encounter and synergy of state-of-the-art astronomical detectors and exotic quantum beams", and JSPS KAKENHI (grants nos. 18H05459, 18H05457, 18H01219, 17H01121, 19J22055, and 18H01220). This work was also supported by GP-PU Tohoku University, Grant-in-Aid for JSPS Research Fellow 23KJ0100 (Two of the authors, KO and RK, are JSPS Research Fellow).

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Publication: K. Okuyama et al., "Study of the Λ/Σ0 electroproduction in the low-Q2 region at JLab" , EPJ Web Conf., 271(2022) 02003

Presenters

  • KAZUKI OKUYAMA

    • Tohoku University

Authors

  • KAZUKI OKUYAMA

    • Tohoku University

  • Takeru Akiyama

    • Tohoku University

  • Petr Bydžovský

    • Nuclear Physics Institute, CAS

  • Yu Fujii

    • Tohoku Medical and Pharmaceutical University

  • Franco Garibaldi

    • INFN
    • INFN, Sezione di Roma

  • Toshiyuki Gogami

    • Kyoto University
    • Kyoto Univ

  • Tatsuhiro Ishige

    • Tohoku University

  • Masashi Kaneta

    • Tohoku University
    • Tohoku Univ

  • Ryoko Kino

    • Tohoku University

  • Pete C Markowitz

    • Florida International University

  • Masaya Mizuno

    • Tohoku University

  • Sho Nagao

    • The University of Tokyo

  • Satoshi N Nakamura

    • The University of Tokyo

  • Kotaro Nishi

    • The University of Tokyo

  • Ken Nishida

    • The University of Tokyo

  • Joerg Reinhold

    • Florida International University

  • Dalibor Skoupil

    • Nuclear Physics Institute, CAS

  • Liguang Tang

    • Hampton Univ

  • Guido M Urciuoli

    • INFN
    • INFN, Sezione di Roma

  • Daigo Watanabe

    • Tohoku University
    • Tohoku Univ