Role of $Y(4630)$ in the $p\bar{p}\to {\Lambda }_c{\bar{\Lambda }}_c$ reaction near threshold

Abstract

We investigate the charmed baryon production reaction $p\bar{p}\to {\Lambda }_c{\bar{\Lambda }}_c$ in an effective Lagrangian approach. Besides the $t$-channel $D^0$ and $D^{\ast 0}$ mesons exchanges, the $s$-channel $Y(4630)$ meson exchange is taken into account. For the total cross sections, the $D^0$ and $D^{\ast 0}$ mesons provide minor background contributions, while the $Y(4630)$ state gives a clear peak structure with the magnitude of 10 $\mu$b at center of mass energy 4.63 GeV. Basing on the results, we suggest that the reaction of $p\bar{p}\to {\Lambda }_c{\bar{\Lambda }}_c$ can be used to search for the $1^{--}$ charmonium-like $Y(4630)$ state, and our predictions can be tested in future by the $\bar{\mathrm{P}}\mathrm{ANDA}$ facility.

Comments: 5 pages, 3figures