Drag Induced Radiation and Multi-Stage Effects in Heavy-Flavor Energy Loss

TL;DR

This paper presents a multi-stage model for heavy-quark energy loss in Quark Gluon Plasma, combining different emission formalisms, and demonstrates its consistency with experimental data and transport coefficients similar to light flavors.

Contribution

It introduces a multi-stage approach to heavy-quark energy loss, integrating different emission mechanisms based on quark momentum, and validates it with experimental data.

Findings

Agreement with CMS data for B and D meson suppression

Transport coefficients align with those for light flavors

Multi-stage model captures different energy loss regimes

Abstract

It is argued that heavy-quarks traversing a Quark Gluon Plasma, undergo a multi-stage modification process, similar to the case of light flavors. Such an approach is applied to heavy-quark energy loss, which includes a rare-scattering, multiple emission formalism at momenta large compared to the mass (sensitive only to the transverse diffusion coefficient $\hat{q}$), and a single scattering induced emission formalism (Gunion-Bertsch) at momenta comparable to the mass of the quark [sensitive to $\hat{q}$, and the longitudinal drag ($\hat{e}$) and diffusion ($\hat{e}_2$) coefficients]. The application of such a multi-stage approach within a 2+1D viscous fluid-dynamical simulation leads to simultaneous agreement with experimental data for the nuclear modification factor of both $B$ and $D$ mesons, as measured by the CMS collaboration at the LHC. The extracted transport coefficients are found to be consistent with those for light flavors.