Evidence for a narrow N(1685) resonance in eta photoproduction off the nucleon

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dc.creatorKuznetsov, V.
dc.creatorPolyakov, M. V.
dc.creatorBoiko, T.
dc.creatorJang, J.
dc.creatorKim, A.
dc.creatorKim, W.
dc.creatorLee, H. S.
dc.creatorNi, A.
dc.creatorYang, G. -S.
dc.date2008-07-15
dc.date.accessioned2026-07-07T12:20:06Z
dc.date.available2026-07-07T12:20:06Z
dc.descriptionRevised analysis of Sigma beam asymmetry for eta photoproduction off the free proton from GRAAL is presented. New analysis reveals a narrow structure near W ~1.685 GeV. We describe this structure by the contribution of a narrow resonance with quantum numbers P_{11}, or P_{13}, or D_{13}. Being considered together with the recent observations of a bump-like structure at W~1.68 GeV in the quasi-free eta photoproduction off the neutron, this result provides an evidence for a narrow (Gamma < 25 MeV) N*(1685) resonance. Properties of this possible new nucleon state, namely the mass, the narrow width, and the much stronger photocoupling to the neutron, are similar to those predicted for the non-strange member of anti-decouplet of exotic baryons.
dc.descriptionTo appear in Acta Physics Polonica B39. Considerably extended version of hep-ex/0703003
dc.identifierhttps://arxiv.org/abs/0807.2316
dc.identifierhttp://arxiv.org/abs/0807.2316
dc.identifierActa Phys.Polon.B39:1949-1967,2008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/212977
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titleEvidence for a narrow N(1685) resonance in eta photoproduction off the nucleon
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