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

Author:
Kuznetsov, V.  Polyakov, M. V.  Boiko, T.  Jang, J.  Kim, A.  Kim, W.  Lee, H. S.  Ni, A.  Yang, G. -S.  


Journal:
ACTA PHYSICA POLONICA B


Issue Date:
2008


Abstract(summary):

Revised analysis of Sigma beam asymmetry for eta photoproduction off the free proton from GRAAL is presented. New analysis reveals a narrow structure near W similar to 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 similar to 1.68 GeV in the quasi-free 77 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-decuplet of exotic baryons.


Page:
1949---1967


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