Eta photoproduction off the neutron at GRAAL
/ Authors
V.Kuznetsov, O.Bartalini, V.Bellini, M.Castoldi, A.D’Angelo, J.-P.Didelez, R. Salvo, A.Fantini, D.Franco, G.Gervino
and 17 more authors
F.Ghio, B.Girolami, A.Giusa, M.Guidal, E.Hourany, R.Kunne, A.Lapik, P. Sandri, D.Moricciani, L.Nicoletti, C.Randieri, N.Rudnev, G.Russo, C.Schaerf, M.-L.Sperduto, M.-C.Sutera, A.Turinge
/ Abstract
The gamma n -> eta n quasi-free cross section reveals a resonant structure at W ~ 1.675 GeV. This structure may be a manifestation of a baryon resonance. A priori its properties, the possibly narrow width and the strong photocoupling to the neutron, look surprising. This structure may also signal the existence of a narrow state.