Production of charmed baryon ${\Lambda }_c(2940)$ by kaon-induced reaction on a proton target

Abstract

We investigate the possibility to study the charmed baryon ${\Lambda }_c(2940)$ by kaon-induced reaction on a proton target. By assuming the ${\Lambda }_c(2940)$ as a $p{D}^{\ast 0}$ molecular state with spin-parity $J^p=1/2^{\pm }$, an effective Lagrangian approach was adopted to calculate the cross section, the $D^{0}p$ invariant mass spectrum and Dalitz plot of the $\Lambda (2940)$ production. The total cross section of the $K^{-}p\to {\Lambda }_c(2940)D_s^{-}$ reaction is found at an order of magnitude about 10 $\mu$b. By considering the sub sequential decay ${\Lambda }_c(2940)\to D^{0}p$ with contributions from the ${\Lambda }_c(2286)$ and the ${\Sigma }_c(2455)$ as background, the $K^{-}p\to D_s^{-}{D}^{0}p$ reaction are studied. It is found that the ${\Lambda }_c(2940)$ is produced mainly at forward angles. The ${\Lambda }_c(2940)$ signal is predicted to be significant in the $D^{0}p$ invariant mass spectrum and the Dalitz plot of the $K^{-}p\to D_s^{-}{D}^{0}p$ reaction. The results suggest that it is promising to study the ${\Lambda }_c(2940)$ with high-energy kaon beam on a proton target in experiment.

Comments: 6 pages, 6 figures