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Photoproduction off the nucleon revisited: Evidence for a narrow N(1688) resonance?

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arxiv 0801.0778 v1 pith:QLAYGNPD submitted 2008-01-05 hep-ex

V. Kuznetsov , M. V. Polyakov , T. Boiko , J. Jang , A. Kim , W. Kim , A. Ni , G. Yang This is my paper
classification hep-ex
keywords photoproductionanalysisevidencenarrowresonancestructureasymmetrybeam
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abstract

Revised analysis of $\Sigma$ beam asymmetry for the $\eta$ photoproduction on the free proton reveals a structure at $W\sim 1.69$ GeV. Fit of the experimental data based on the E429 solution of the SAID partial wave analysis suggests a narrow ($\Gamma \leq 25$ MeV) resonance. Possible candidates are $P_{11}, P_{13}$, or $D_{13}$ resonances. The result is considered in conjunction with the recent evidence for a bump-like structure at $W\sim 1.67 - 1.68$ GeV in the quasi-free $\eta$ photoproduction on the neutron.

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