Production of $J/\psi p\bar{p}$ in electron-positron collisions

Abstract

The discoveries of the hidden-charm $P_c$ pentaquarks by the LHCb Collaboration have been not confirmed by other experiments yet. It is desirable to investigate the feasibility of observing them in other experiments. We present an order-of-magnitude estimate of the cross section of the $e^{+}{e}^{-}\to J/\psi p\bar{p}$ process, where the hidden-charm pentaquarks may be searched for, and find it to be of $\mathcal{O}(4\text{fb})$ when the $e^{+}{e}^{-}$ c.m. energy is around 6 GeV. The cross section for $e^{+}{e}^{-}\to P_c\bar{p}$ is then estimated to be $\lesssim \mathcal{O}(0.1\text{pb})$. Thus, it is promising to search for $P_c$ at the future high-luminosity super tau-charm facilities with annual integrated luminosity about $1a{b}^{-1}$. We also predict the branching fraction of ${\rm Y}\to J/\psi p\bar{p}$ to be of $\mathcal{O}(2\times 10^{-6})$, which can be tested at $B$ factories.

Comments: version accepted for publication in PLB 9 pages, 3 figures