B meson production in Pb+Pb at 5.02 ATeV at LHC: Estimating the diffusion coefficient in the infinite mass limit

In the last decade a Quasi-Particle Model (QPM) has been developed to study charm quark dynamics in ultrarelativistic heavy-ion collisions supplying a satisfactory description of the main observables for D meson and providing an estimate of the space-diffusion coefficient D-s(T) from the phenomenology. In this paper, we extend the approach to bottom quarks describing their propagation in the quark-gluon plasma within an event-by-event full Boltzmann transport approach followed by a coalescence plus fragmentation hadronization. We find that QPM approach is able to correctly predict the first available data on R-AA(pT) and v(2)(pT) of single-electron from B decays without any parameter modification w.r.t. the charm. We show also predictions for centralities where data are not yet available for both v(2)(pT) and v(3)(pT). Moreover, we discuss the significant breaking of the expected scaling of the thermalization time tau(th) with M-Q/T, discussing the evolution with mass of D-s(T) to better assess the comparison to lQCD calculations. We find that at T = T-c charm quark Ds(T) is about a factor of 2 larger than the asymptotic value for M -> infinity, while bottom D-s(T) is only a 20% higher. This implies a D-s(T) which is consistent within the current uncertainty to the most recent lattice QCD calculations with dynamical quarks for M -> infinity.