\begin{document}$N^*(920)$\end{document}, with varying pion masses in the scheme of linear σ model with nucleons, using the \begin{document}$N/D$\end{document} unitarization method. We find that, as the pion mass increases, the pole moves toward the real axis. For larger pion masses, at tree level, the pole falls to a specific point on u-channel cut and crosses to the adjacent Riemann sheet defined by the logarithmic u-channel cut. At the one-loop level, the pole does not meet the u-cut up to \begin{document}$m_\pi=0.36$\end{document} GeV. We also re-examined the σ pole trajectory and found it to be in good agreement with the Roy equation analysis result."> On the pole trajectory of the subthreshold negative parity nucleon with varying pion masses -
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