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

The strong decays of the $N^{\ast }(1535)$ 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 $N^{\ast }(1535)$ contribute significantly to the $N^{}(1535)\to N\pi$and$N^{}(1535)\to N\eta$decays\mathrm{.}Thecontributionstothe$N\eta$ decay come from both the lowest energy and the next-to-lowest energy five-quarks components, while the contributions to the $N\pi$ decay come from only the latter one. Taking these contributions into account, the description for the strong decays of $N^{\ast }(1535)$ is improved, especially, for the puzzling large ratio of the decays to $N\eta$ and $N\pi$.