Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
/ Authors
V.Kuznetsov, S.Churikova, G.Gervino, F.Ghio, B.Girolami, D.Ivanov, J.Jang, A.Kim, W.Kim, A.Ni
and 3 more authors
/ Abstract
New results on quasi-free η photoproduction on the neutron and proton bound in a deuteron target are presented. The γn → ηn quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow ( M ∼ 1 . 68 GeV, Γ ≤ 30 MeV) baryon state.