https://doi.org/10.1140/epja/i2015-15072-5
Regular Article - Experimental Physics
Interference phenomena in the JP = 1/2− wave in η photoproduction
1
Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany
2
Petersburg Nuclear Physics Institute, Gatchina, Russia
3
Departement für Physik, Universität Basel, Basel, Switzerland
* e-mail: klempt@hiskp.uni-bonn.de
Received:
6
May
2015
Accepted:
28
May
2015
Published online:
30
June
2015
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 γη → 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.
© SIF, Springer-Verlag Berlin Heidelberg, 2015
