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

High Energy Physics - Phenomenology;High Energy Physics - Experiment;Nuclear Theory