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Strong decays of $N^{*}(1535)$ in an extended chiral quark model

The strong decays of the $N^{*}(1535)$ resonance are investigated in an extended chiral quark model by including the low-lying $qqqq\bar{q}$ components in addition to the $qqq$ component. The results show that these five-quark components in $N^{*}(1535)$ contribute significantly to the $N^{*}(1535)\to Nπ$ and $N^{*}(1535)\to Nη$ decays. The contributions to the $Nη$ decay come from both the lowest energy and the next-to-lowest energy five-quarks components, while the contributions to the $Nπ$ decay come from only the latter one. Taking these contributions into account, the description for the strong decays of $N^{*}(1535)$ is improved, especially, for the puzzling large ratio of the decays to $Nη$ and $Nπ$.