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Within a chiral constituent quark model approach, $\eta$-meson production onthe proton {\it via} electromagnetic and hadron probes are studied. With fewparameters, differential cross-section and polarized beam asymmetry for \gammap \to \eta p$ and differential cross section for $\pi^- p\to \eta n$ processesare calculated and successfully compared with the data in the center-of-massenergy range from threshold up to 2 GeV. The five known resonances$S_{11}(1535)$, $S_{11}(1650)$, $P_{13}(1720)$, $D_{13}(1520)$, and$F_{15}(1680)$ are found to be dominant in the reaction mechanisms in bothchannels. Possible roles plaied by new resonances are also investigated and inthe photoproduction channel, significant contribution from $S_{11}$- and$D_{15}$-resonances, with masses around 1715 MeV and 2090 MeV, respectively,are deduced. For the so-called missing resonances, no evidence is found withinthe investigated reactions. The helicity amplitudes and decay widths of $N^*\to \pi N, \eta N$ are also presented, and found consistent with the PDGvalues.

Combined study of gamma p to eta p and pi-p to eta n in a chiral constituent quark approach