The Analysis Status of Σ+p Scattering Events in the J-PARC E40 Experiment

for the J-PARC E40 collaboration

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1 Citation (Scopus)


The J-PARC E40 experiment aims for measuring cross sections of the Σp scatterings with high statistics by overcoming difficulties of hyperon-nucleon scattering experiment. The physics motivations are to verify the large repulsive force due to quark Pauli effect in the Σ+p interaction and to perform systematic study of the ΣN interaction. Physics data taking was performed at the K1.8 beam line in the J-PARC hadron experimental facility by 2020 June. Σ+ particles were produced via the π+p→ K+Σ+ reaction and their momenta were tagged with spectrometers. Recoil proton of the Σ+p scatterings and proton from the Σ+→ pπ decay were detected with surrounding detector system CATCH. The Σ+p scattering can be identified by checking the consistency for the recoil proton between the measured energy and the calculated energy from kinematics of the Σ+p scattering. In present analysis, 69M Σ+ particles are tagged as the Σ+ beam and 4500 Σ+p scattering events are identified. Further analysis to derive the differential cross sections is ongoing.

Original languageEnglish
Article number110
JournalFew-Body Systems
Issue number4
Publication statusPublished - 2021 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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