Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron

Kuznetsov, V.; Churikova, S.; Gervino, G.; Ghio, F.; Girolami, B.; Ivanov, D.; Jang, J.; Kim, A.; Kim, W.; Ni, A.; Vorobiev, Yu.; Yurov, M.; Zabrodin, A.

Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron

Authors

Description

New results on quasi-free $η$ photoproduction on the neutron and proton bound in a deuteron target are presented. The $γn \to ηn$ 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 ($M\sim 1.68$ GeV, $Γ\leq 30$ MeV) baryon state.
Replaced with published version