Evidence for narrow resonant structures at $W\approx 1.68$ and $W\approx 1.72$ GeV in real Compton scattering off the proton

V. Kuznetsov, F. Mammoliti, V. Bellini +7

First measurement of the beam asymmetry $\Sigma$ for Compton scattering off the proton in the energy range $E_{\gamma }=0.85-1.25$ GeV is presented. The data reveals two narrow structures at…