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

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 2πT D${}_s$(T${}_c$) $\simeq$ 6. With the parameter-optimized model, we are able to describe simultaneously the prompt D${}^0$R${}_{AA}$ and $v_2$ data at p${}_T$ ≤ 8 GeV in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 and $\sqrt{s_{NN}}$ = 5.02 TeV. We also make predictions for non-prompt D${}^0$ meson for future experimental tests down to the low momentum region.