Search for η′ Bound Nuclei in the C 12 (γ,p) Reaction with Simultaneous Detection of Decay Products

(LEPS2/BGOegg Collaboration)

Research output: Contribution to journalArticle

Abstract

We measured missing mass spectrum of the C12(γ,p) reaction for the first time in coincidence with potential decay products from η′ bound nuclei. We tagged an (η+p) pair associated with the η′N→ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cosθlabηp<-0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η′ production rate. Our results indicate a small branching fraction of the η′N→ηN process and/or a shallow η′-nucleus potential.

Original languageEnglish
Article number202501
JournalPhysical review letters
Volume124
Issue number20
DOIs
Publication statusPublished - 2020 May 22

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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