The $P_{\psi s}^{\mathrm{\Lambda }}(4338)$ pentaquark and its partners in the molecular picture

The LHCb collaboration has detected a new hidden-charm pentaquark with the quantum numbers of a $\mathrm{\Lambda }$ baryon: the $P_{\psi s}^{\mathrm{\Lambda }}(4338)$. This pentaquark will be interpreted as a ${\bar{D}}_s{\mathrm{\Lambda }}_c$-$\bar{D}{\mathrm{\Xi }}_c$ resonance within a contact-range theory. Here we briefly comment on the relation of the new $P_{\psi s}^{\mathrm{\Lambda }}(4338)$ with the $P_{\psi s}^{\mathrm{\Lambda }}(4459)$. We find that the $P_{\psi s}^{\mathrm{\Lambda }}(4338)$ and $P_{\psi s}^{\mathrm{\Lambda }}(4459)$ both accept a common description in terms of the same parameters, which predicts the existence of a few additional $P_{\psi }^N$, $P_{\psi s}^{\mathrm{\Lambda }}$, $P_{\psi s}^{\mathrm{\Sigma }}$ and $P_{\psi ss}^{\mathrm{\Xi }}$ molecular pentaquarks composed of a charmed antimeson and an antitriplet charmed baryon. The most robust of these predicted pentaquarks is a $P_{\psi s}^{\mathrm{\Lambda }}$ with a mass in the $(4235-4255)\mathrm{M}\mathrm{e}\mathrm{V}$ range, while other two interesting ones are a $P_{\psi }^N(4150)$ and a $P_{\psi }^{\mathrm{\Sigma }}(4335)$, the latter basically at the same mass as the $P_{\psi }^{\mathrm{\Lambda }}(4338)$, with which it might mix owing to isospin symmetry breaking effects.