Orateur
Description
Quasi-Particle Model (QPM) allows for a good description of the main features of lattice QCD (lQCD) thermodynamics and for charm quark supplies a satisfying description of $R_{AA}(p_T)$ and $v_2(p_T)$ of D mesons[1,2]. Within an event-by-event full Boltzmann transport approach followed by a hybrid hadronization via coalescence plus fragmentation, we investigate the extension to bottom quark dynamics discussing predictions for $R_{AA}(p_T)$ and $v_{2,3}(p_T)$ of B mesons comparing to the available experimental data by ALICE collaboration on electrons from B meson decay [3]. A sizeable $v_{2,3}$ is found with important implications on bottomonium $\Upsilon$ production. Furthermore, the extension to bottom quark allows to investigate the mass dependence of $D_s(T)$ towards the infinite mass limit assumed in lQCD calculations. We find a significant breaking of the scaling of thermalization time $\tau_{th}$ with $M_Q/T$, entailing a $D_s$ for $M\rightarrow \infty$ in agreement with the recent lQCD data with dynamical quarks. Furthermore, we extend our QPM approach to a more realistic model in which partonic propagators explicitly depend on quark momentum (QPMp) following Dyson-Schwinger studies [4]. The QPMp improves the description of lQCD quark susceptibilities, understimated in the standard QPM approach and entails a $D_s$ with a stronger non-perturbative behaviour near to $T_c$ which leads to a better agreement with the recent lQCD data.The implication of QPMp extensions on the $R_{AA}(p_T)$ and $v_n (p_T)$ is under study and hints at a lowering of the global $\chi^2$ toward a more solid extrapolation of $D_s(T)$.
[1] M. L. Sambataro, S. Plumari and V. Greco, Eur. Phys. J. C 80 (2020) no.12, 1140.
[2] M.L.Sambataro, Y, Sun, V. Minissale, S.Plumari and V.Greco, Eur.Phys.J.C 82 (2022) 9, 833 .
[3] M.L.Sambataro, V. Minissale, S. Plumari and V. Greco, Phys.Lett.B 849 (2024) 138480.
[4] M.L.Sambataro et al., in preparation.
