Langevin dynamics of heavy quarks in a soft-hard factorized approach

Abstract

By utilizing a soft-hard factorized model, which combines a thermal perturbative description of soft scatterings and a perturbative QCD-based calculation for hard collisions, we study the energy and temperature dependence of the heavy quark diffusion coefficients in Langevin dynamics. The adjustable parameters are fixed from the comprehensive model-data comparison. We find that a small value of the spatial diffusion coefficient at transition temperature is preferred by data 2pi TD_{s}(T_{c}) simeq 6. With the parameter-optimized model, we are able to describe simultaneously the prompt D^{0}R_{mathrm{AA}} and v_{mathrm{2}} data at p_{mathrm{T}}le 8 GeV in Pb–Pb collisions at sqrt{s_{mathrm{NN}}}=2.76 and sqrt{s_{mathrm{NN}}}=5.02 TeV. We also make predictions for non-prompt D^{0} meson for future experimental tests down to the low momentum region.