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

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

2006-06-30

arxiv.org/abs/hep-ex/0606065v2

Phys.Lett.B647:23-29,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Replaced with published version

Scientific paper

10.1016/j.physletb.2007.01.041

New results on quasi-free $\eta$ photoproduction on the neutron and proton
bound in a deuteron target are presented. The $\gamma n \to \eta n$ 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 ($M\sim 1.68$ GeV, $\Gamma \leq 30$ MeV) baryon state.

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