Charmed hadron photoproduction at COMPASS

Abstract

Photoproduction of the charmonium-like state $Z_c(4200)$ and the charmed baryon ${\Lambda }_c^{\ast }(2940)$ is investigated with an effective Lagrangian approach and the Regge trajectories applying to the COMPASS experiment. Combining the experimental data from COMPASS and our theoretical model we estimate the upper limit of ${\Gamma }_{Z_c(4200)\to J/\psi \pi }$ to be of about 37 MeV. Moreover, the possibility to produce ${\Lambda }_c^{\ast }(2940)$ at COMPASS is discussed. It seems one can try to search for this hadron in the missing mass spectrum since the $t$-channel is dominating for the ${\Lambda }_c^{\ast }(2940)$ photoproduction.

Comments: Proceedings of the Second International Symposium on Physics of Photons (ISPP 15), Lanzhou, China, July 2016