Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
Abstract
New results on quasi-free η photoproduction on the neutron and proton bound in a deuteron target are presented. The γ n η n 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, ≤ 30 MeV) baryon state.
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