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arxiv: hep-ex/0601002 · v1 · pith:5HQM6LVHnew · submitted 2005-12-31 · ✦ hep-ex

Eta photoproduction off the neutron at GRAAL

V.Kuznetsov , O.Bartalini , V.Bellini , M.Castoldi , A.D'Angelo , J.-P.Didelez , R.Di Salvo , A.Fantini
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D.Franco G.Gervino F.Ghio B.Girolami A.Giusa M.Guidal E.Hourany R.Kunne A.Lapik P.Levi Sandri D.Moricciani L.Nicoletti C.Randieri N.Rudnev G.Russo C.Schaerf M.-L.Sperduto M.-C.Sutera A.Turinge
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classification ✦ hep-ex
keywords structurenarrowneutronbaryoncrossexistencegammagraal
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The gamma n -> eta n quasi-free cross section reveals a resonant structure at W ~ 1.675 GeV. This structure may be a manifestation of a baryon resonance. A priori its properties, the possibly narrow width and the strong photocoupling to the neutron, look surprising. This structure may also signal the existence of a narrow state.

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