Investigating charm quark interactions and hadronization in PbPb collisions with $\mathrm{D}_{s}^{\pm}$ and $\mathrm{\Lambda}_{c}^{\pm}$ measurements

TL;DR

This paper presents high-precision measurements of charm hadron flow and yields in Pb-Pb collisions at 5.02 TeV, providing insights into charm quark interactions, energy loss, and hadronization in the Quark-Gluon Plasma.

Contribution

It offers new detailed measurements of D_s and Lambda_c production and flow, enhancing understanding of charm quark hadronization and energy loss mechanisms in heavy-ion collisions.

Findings

D_s meson flow extends previous measurements, showing charm quark collectivity.

Lambda_c R_AA varies with transverse momentum and centrality, indicating charm quark energy loss.

Lambda_c/D^0 ratio measurements constrain charm hadronization models.

Abstract

Charm quarks serve as a sensitive probe of the Quark-Gluon Plasma (QGP), providing direct insights into its formation, evolution, and properties. In this proceeding, we present new high-precision measurements from the CMS experiment in Pb-Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The elliptic ($v_2$) and triangular ($v_3$) flow of prompt $\mathrm{D}_{s}^{\pm}$ mesons are measured with high precision, extending the kinematic coverage. A comparison of the $\mathrm{D}_{s}^{\pm}$ flow to that of $\mathrm{{D}^{0}}$ mesons is performed to investigate the impact of strange quark hadronization on charm quark collectivity. We further explore charm quark hadronization by measuring the $\mathrm{\Lambda}_{c}^{\pm}$ nuclear modification factor ($R_{AA}$) as a function of transverse momentum for different collision centralities, and the $\mathrm{\Lambda}_{c}^{\pm}$/$\mathrm{{D}^{0}}$ yield ratio in pp, pPb, and Pb-Pb collisions. These results provide crucial constraints on charm quark energy loss and hadronization mechanisms, offering critical tests for theoretical models and advancing our understanding of heavy quark dynamics in the QGP.