Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
V. Kuznetsov, S. Churikova, G. Gervino, F. Ghio, B. Girolami, D. Ivanov, J. Jang, A. Kim, W. Kim, A. Ni, Yu. Vorobiev, M. Yurov, A. Zabrodin
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.
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