Speaker
Description
We discuss the dynamical evolution of charm quark elastic energy loss in a bulk medium at fixed temperature $T$ extending the Boltzmann (BM) collision integral to include off-shell dynamics. We show the results on the transport coefficients and the time evolution of charm quark making a comparison among the Langevin dynamics, the BM collisional integral within a Quasi-Particle Model(QPM) approximation with on-shell QGP medium and the BM collision integral extended to a dynamical quasi-particles model with off-shell bulk particles. We also study the propagation of both charm and bottom quarks in the QGP by means of a full on-shell Boltzmann transport approach within an hybrid coalescence plus fragmentation hadronization model. We show the D-mesons $R_{AA}$ and $v_2$ at RHIC and LHC energies also discussing the role of the initial state fluctuations on the development of high-order heavy-flavor flow harmonics ($v_n(p_T)$, $n=3,4$). The results presented include event-shape selected D-meson spectra and $v_n$, correlations between different D-meson flow harmonics at LHC energies in different range of centrality selections. The events in centrality class are divided according to magnitude of the second-order harmonic reduced flow vector $q_2$. In the same scheme we show predictions for $R_{AA}$, $v_2$ and $v_3$ of B-mesons and both electrons and muons from semileptonic B-meson decays at top LHC energies. Within this approach the extracted T-dependence of the space-diffusion coefficient $D_s$ of both charm and bottom quarks is in a agreement with lattice QCD data within the systematic uncertainties. Lately, we have extended QPM approach to partonic propagators that explicitly depend on three-momentum of particles, futhermore we discuss the impact of momentum-dependent partonic masses on the $D_s$ coefficient providing novel and powerful constraints for heavy-flavour transport coefficients.\
[1] M.L.Sambataro, S.Plumari and V.Greco, Eur. Phys. J. C 80, no.12, 1140
(2020).\
[2] S.Plumari et al., Phys.Lett.B 805 (2020) 135460.\
[2] M.L.Sambataro, S.Plumari, Y. Sun, V. Minissale and V.Greco, in preparation.
