Probing the QGP through $p_T$-differential radial flow of heavy quarks

Maria Lucia Sambataro; Salvatore Plumari; Santosh K. Das; Vincenzo Greco

Probing the QGP through $p_T$-differential radial flow of heavy quarks

Maria Lucia Sambataro, Salvatore Plumari, Santosh K. Das, Vincenzo Greco

Abstract

We introduce the $p_T$-differential radial flow $v_0(p_T)$ in the heavy-quark sector. Within an event-by-event Langevin framework, we show that this observable exhibits a strong sensitivity to the heavy quark-bulk interaction. It provides a powerful and novel tool to constrain the transport coefficients of heavy quarks in the QGP and, more generally, to assess the strength of the interaction of a Brownian particle in an expanding bulk medium. The results further indicate that heavy quarks exhibit collective behavior driven by the isotropic expansion of the QGP in heavy-ion collisions and, at low $p_T$, it offers a marked signature of the heavy quark hadronization mechanism.

Probing the QGP through $p_T$-differential radial flow of heavy quarks

Abstract

We introduce the

-differential radial flow

in the heavy-quark sector. Within an event-by-event Langevin framework, we show that this observable exhibits a strong sensitivity to the heavy quark-bulk interaction. It provides a powerful and novel tool to constrain the transport coefficients of heavy quarks in the QGP and, more generally, to assess the strength of the interaction of a Brownian particle in an expanding bulk medium. The results further indicate that heavy quarks exhibit collective behavior driven by the isotropic expansion of the QGP in heavy-ion collisions and, at low

, it offers a marked signature of the heavy quark hadronization mechanism.

Paper Structure (7 equations, 4 figures)

This paper contains 7 equations, 4 figures.

Figures (4)

Figure 1: Spatial diffusion coefficient $2\pi T D_s$ in $QPM_p$ and $T$-matrix approaches for charm quark compared to available lQCD data.
Figure 2: $v_0(p_T)$ for charm quark at $0- 10 \, \%$ (left) and $30 -50 \, \%$ (right) in the different cases studied.
Figure 3: $v_0(p_T)$ at $0- 10 \, \%$ centrality class for D meson (left) and $\Lambda_c$ baryon (right) from fragmentation and coalescence for the different cases discussed.
Figure 4: $v_0(p_T)$ at $0- 10 \, \%$ (left) and $30-50 \, \%$ (middle) for D meson (red dashed line) and $\Lambda_c$ baryon (blue solid line) in $QPM_p$ from coalescence plus fragmentation. (right) D meson (red dashed line) and $\Lambda_c$ (blue solid line) $v_0(p_T)$ at $30 -50 \, \%$ centrality class for $p_T=1 \, GeV$ (circles) and $p_T=4 \, GeV$ (diamonds) as function of $2\pi T D_s$.