Photoproduction off the nucleon revisited: Evidence for a narrow N(1688) resonance?

V. Kuznetsov, M. V. Polyakov, T. Boiko +5

Revised analysis of $\Sigma$ beam asymmetry for the $\eta$ photoproduction on the free proton reveals a structure at $W\sim 1.69$ GeV. Fit of the experimental data based on the E429 soluti…