Interference phenomena in the J^P=1/2^--wave in η photoproduction

2015/01/09 by A. V. Anisovich, Anisovich, A. V., E. Klempt +11
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #nucl-ex

paper · pdf · doi:10.48550/arxiv.1501.02093

10 pages, 13 figures, accepted for publication in EPJA

arxiv created 2015/06/01 · arxiv updated 2015/06/02

Abstract

The recent precise experimental results for the photoproduction of η-mesons off the neutron measured with the Crystal Ball/TAPS calorimeter at the MAMI accelerator have been investigated in detail in the framework of the Bonn-Gatchina coupled channel model. The main result is that the narrow structure observed in the excitation function of γn → nη can be reproduced fully with a particular interference pattern in the J^P=1/2^- partial wave. Introduction of the narrow resonance N(1685) with the properties reported in earlier publications deteriorates the quality of the fit.

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