Large violation of the flavour SU(3) symmetry in $\eta$MAID2018 isobar model

V. A. Kuznetsov, M. V. Polyakov

We demonstrate that the explanation of the neutron anomaly around $W\sim 1685$MeV in $\gamma N\to \eta N$ reactions provided by the $\eta$MAID2018 isobar model is based on large violation of th…