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It has recently been proven that the invariance of observables with respectto angle dependent phase rotations of reaction amplitudes mixes multipoleschanging also their relative strength [1]. All contemporary partial waveanalyses (PWA) in $\eta$ photoproduction on protons, either energy dependent(ED) [2-5] or single energy (SE) [6] do not take this effect intoconsideration. It is commonly accepted that there exist quite some similarityin the $E0+$ multipole for all PWA, but notable differences in this, but alsoin remaining partial waves still remain. In this paper we demonstrate that oncethis phase rotations are properly taken into account, all contemporary ED andSE partial wave analysis become almost identical for the dominant $E0+$multipole, and the agreement among all other multipoles becomes much better. Wealso show that the the measured observables are almost equally well reproducedfor all PWA, and the remaining differences among multipoles can be attributedsolely to the difference of predictions for unmeasured observables. So, newmeasurements are needed.

The role of angle dependent phase rotations of reaction amplitudes in $\eta$ photoproduction on protons