YAN, Mao-Jun; PENG, Fang-Zheng; SÁNCHEZ SÁNCHEZ, Mario; PAVON VALDERRAMA, Manuel

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YAN, Mao-Jun

PENG, Fang-Zheng

SÁNCHEZ SÁNCHEZ, Mario
Laboratoire de Physique des Deux Infinis Bordeaux [LP2I - Bordeaux]

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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.< Réduire

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isospin

symmetry breaking

effect

pentaquark

baryon

LHC-B

quantum number

charmed baryon

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

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