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Title: Study of η and η ' Photoproduction at MAMI

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 η MAID 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 η MAID fit to available η and η0 photoproduction data allows the determination of the Nð1895Þ1=2 - properties.
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Publication Date:
Grant/Contract Number:
FG02-88ER40415; FG02-99-ER41110; FG02-01-ER41194; FG02-SC0016583; SC0016583
Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Massachusetts, Amherst, MA (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
A2 Collaboration at MAMI
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1359985
Alternate Identifier(s):
OSTI ID: 1425342; OSTI ID: 1439785