Speaker
Description
The nuclear modification of quarkonium production serves as crucial evidence for the deconfined QCD medium production in nuclear collisions. This modification is influenced not only by medium dissociation but also by a collection of initial and final state effects. The production of excited charmonium states in pPb collisions presents a controlled setting to further investigate these phenomena. Notably, the production of the $\chi_c$ mesons offers valuable insights into the feed-down processes and binding energy dependencies of charmonia in nuclear collisions, as their mass is situated between the ground state and the $\psi(2S)$.
In this presentation, we report on our CMS measurements of $\chi_c$ meson production in pPb collisions. We report on the relative production rates of $\chi_{c1,2}$ in relation to $J/\psi$. Our analysis measures the cross-section ratios as a function of particle transverse momentum, rapidity, and event activity. These results are then compared with other LHC measurements and theoretical predictions, providing deeper insight into the production mechanisms of $\chi_c$ states in nuclear collisions.
