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Study of η and η' Photoproduction at MAMI.

Author
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Abstract
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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 (E_{γ}=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.

Year of Publication
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2017
Journal
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Physical review letters
Volume
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118
Issue
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21
Number of Pages
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212001
Date Published
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2017
ISSN Number
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0031-9007
URL
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http://link.aps.org/abstract/PRL/v118/p212001
DOI
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10.1103/PhysRevLett.118.212001
Short Title
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Phys Rev Lett
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