η photoproduction of nucleons and the structure of the resonanceS11(1535) in the quark model

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Abstract
In this paper, we present our study on the \eta photoproduction based on the chiral quark model. We find that quark model provides a very good description of the \eta production with much less parameters, and the threshold region is not a reliable source to determine the \eta NN coupling constant due to its strong dependence on the properties of the resonance S_{11}(1535). We suggest that the systematic data in E_{lab}=1.2 \sim 1.4 GeV region may help us to determine the \eta NN coupling constant more precisely. The structure of the resonance S_{11}(1535) is discussed, we find that the recent data from Mainz group bring the helicity amplitude much closer to the quark model prediction. However, more studies need to be done to understand the large \eta N branching ratio of the resonance S_{11}(1535). Our results show that the quark model is a very good approach to study the underlying structure of baryon resonances from the meson photoproduction data
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