The LHCb state $P_{\psi s}^{\Lambda }(4338)$ as a triangle singularity

T. J. Burns, E. S. Swanson

We present a model for the $J/\psi \Lambda$ spectrum in $B^{-}\to J/\psi \Lambda \bar{p}$ decays, including the $P_{\psi s}^{\Lambda }(4338)$ baryon recently observed by the LHCb collaboration. We assume production v…