Studies on quark-mass dependence of the $N^{\ast }(920)$ pole from $\pi N$ $\chi$PT amplitudes

Xu Wang, Kai-Ge Kang, Qu-Zhi Li +2

The quark-mass dependence of the $N^{\ast }(920)$ pole is analyzed using $K$-matrix method, with the $\pi N$ scattering amplitude calculated up to $O(p^3)$ order in chiral perturbation theo…