$\Lambda _{c}^{+}(2940)$ photoproduction off the neutron

TL;DR

This paper investigates the photoproduction of the charmed baryon $\\Lambda_c^*(2940)$ off the neutron using an effective Lagrangian approach, highlighting dominant contributions and experimental feasibility.

Contribution

It models the $\\Lambda_c^*(2940)$ as a molecular state and analyzes its photoproduction, providing predictions for cross sections relevant for experimental searches.

Findings

$t$-channel $D^*$ exchange dominates the process.

$s$-channel nucleon pole contributes near threshold.

Total cross section suggests experimental detectability.

Abstract

By assuming that the $\Lambda _{c}^{\ast }(2940)$ 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 $\Lambda _{c}^{\ast }(2940)$ baryon in the $\gamma n\rightarrow D^{-}\Lambda _{c}^{\ast }(2940)^{+}$ 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 $\gamma n\rightarrow D^{-}\Lambda _{c}^{\ast }(2940)^{+}$ reaction is estimated, which indicate it is feasible to searching for the charmed $\Lambda _{c}^{\ast }(2940)$ baryon at the COMPASS experiment.