Mass and $K\Lambda$ coupling of $N^{\ast }(1535)$

B. C. Liu, B. S. Zou

Using resonance isobar model and effective Lagrangian approach, from recent BES results on $J/\psi \to \bar{p}p\eta$ and $\psi \to \bar{p}{K}^{+}\Lambda$, we deduce the ratio between effective coupling con…