Comments on "Interference phenomena in the $J^{p} = 1/2^-$ - wave in $\eta$ photoproduction" by A.V. Anisovich et al. [arXiv:1501.02093]

Abstract

The authors of arXiv:1501.02093v1 claimed that " ... narrow structure observed in the excitation function of $\gamma n \to \eta n$ can be reproduced fully with a particular interference pattern in the $J^{p} = 1/2^-$ partial wave..." while a narrow structure in Compton scattering off the neutron is "...a stand-alone observation unrelated to the structure observed in $\gamma n \to \eta n$...". The source for the second statement may be a simple numerical error. If so, the interpretation of the narrow structure in $\gamma n \to \eta n$ as interference effects in the $J^{p} = 1/2^-$-wave and some conclusions from arXiv:1501.02093v1 are questionable.