11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Measurements of the lightest open-charm baryon, ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$, production can provide important information about the quark coalescence process of hadronization in the quark-gluon plasma (QGP). With strange quark yields being enhanced in the presence of the QGP medium, the production of ${\mathrm{D}}_{\mathrm{s}}^{+}$ is expected to be enhanced in heavy ion collisions if recombination plays an important role in the hadronization process. The high-luminosity data sets collected by the CMS experiment in 2018 have been used to measure ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production via ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}\to {\mathrm{p}}^{+}{\mathrm{K}}^{-}{\pi }^{+}$ in the $p_{\mathrm{T}}$ range 3--30 GeV /c for pp collisions and 6--40 GeV /c for PbPb collisions in different centrality classes. The ${\mathrm{D}}_{\mathrm{s}}^{+}$ production is measured via the decay channel ${\mathrm{D}}_{\mathrm{s}}^{+}\to \varphi {\pi }^{+}\to {\mathrm{K}}^{+}{\mathrm{K}}^{-}{\pi }^{+}$ in the $p_{\mathrm{T}}$ range 2--40 GeV /c in pp collisions and 6--40 GeV /c in PbPb collisions using the data sets collected by CMS detector in 2015. Results of the differential cross section of ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ and ${\mathrm{D}}_{\mathrm{s}}^{+}$, the ratios of ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ and ${\mathrm{D}}_{\mathrm{s}}^{+}$ over ${\mathrm{D}}^0$ yields in pp and PbPb collisions will be presented along with the nuclear modification factors.