$Λ_{c}^{+}(2940)$ photoproduction off the neutron

By assuming that the $Λ_{c}^{\ast }(2940)$ is a $pD^{\ast 0}$ molecular state with spin-parity $J^{P}=\frac{1}{2}^{+}$ and $J^{P}=\frac{1}{2}^{-}$, the photoproduction of charmed $Λ_{c}^{\ast }(2940)$ baryon in the $γn\rightarrow D^{-}Λ_{c}^{\ast }(2940)^{+}$ process is investigated with an effective Lagrangian approach. It is found that the contributions from $t$-channel with $D^{\ast }$ exchange are dominant, while the $s$-channel with nucleon pole exchange give a sizeable contribution around the threshold. The contributions from the $u$-channel and contact term are very small. The total cross section of the $γn\rightarrow D^{-}Λ_{c}^{\ast }(2940)^{+}$ reaction is estimated, which indicate it is feasible to searching for the charmed $Λ_{c}^{\ast }(2940)$ baryon at the COMPASS experiment.

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