Interference phenomena in the $J^P=1/2^{-}$-wave in $\hat{I}\cdot$ photoproduction

Abstract

The recent precise experimental results for the photoproduction of $\hat{I}\cdot$-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 ${\hat{I}}^{3}n\to n\hat{I}\cdot$ 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.

10 pages, 13 figures, accepted for publication in EPJA