Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks

Abstract

On March 26th, 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of three new pentaquarks, namely $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$, which are consistent with the loosely bound molecular hidden-charm pentaquark states composed of an S-wave charmed baryon $\hat{I}{\pounds }_c$ and an S-wave anti-charmed meson ($\bar{D},{\bar{D}}^{\ast }$). In this work, we present a direct calculation by the one-boson-exchange (OBE) model and demonstrate explicitly that the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ do correspond to the loosely bound $\hat{I}{\pounds }_c\bar{D}$ with $(I=1/2,J^P=1/2^{-})$, $\hat{I}{\pounds }_c{\bar{D}}^{\ast }$ with $(I=1/2,J^P=1/2^{-})$ and $\hat{I}{\pounds }_c{\bar{D}}^{\ast }$ with $(I=1/2,J^P=3/2^{-})$, respectively.

5 pages, 1 table and 2 figures. Accepted by Phys. Rev. D as Rapid Communication