Study of η and η′ Photoproduction at MAMI

(A2 Collaboration at MAMI)

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The reactions γp→ηp and γp→η′p are measured from their thresholds up to the center-of-mass energy W=1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η′ threshold, W=1896 MeV (Eγ=1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η′ total cross section from its threshold, can only be explained by a strong coupling of the poorly known N(1895)1/2- state to both ηp and η′p. Including the new high-accuracy results in the ηMAID fit to available η and η′ photoproduction data allows the determination of the N(1895)1/2- properties.

Original languageEnglish (US)
Article number212001
JournalPhysical Review Letters
Volume118
Issue number21
DOIs
StatePublished - May 26 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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