Speaker
Description
We study the propagation of charm and bottom quarks in the quark-gluon plasma (QGP) by means of a relativistic Boltzmann transport approach. The non-perturbative interaction between heavy quarks and light quarks is described by means of a quasi-particle approach in which light partons are dressed with thermal masses. It permits to have an Equation of State close to lattice QCD thermodynamics and naturally induce a non-perturbative interaction that entails only a weak dependence on the temperature, especially around the critical temperature $T_c$. It plays a fundamental role to describe simultaneously the experimental data for the nuclear suppression factor $R_{AA}$ and the elliptic flow $v_2 (p_T )$ of D mesons from RHIC to LHC energies. In the same scheme we present predictions for B mesons that shows a quite significant suppression and allow a determination of the space-diffusion coefficient that is practically independent on the transport scheme for HQ. Moreover, it will be discussed the role of initial state fluctuations to generate high order anisotropic flows $v_3 (p_T )$ and $v_4 (p_T )$ of D mesons. In particular it will be investigated the role of QCD interaction in developing correlations between the light and the heavy flavor anisotropic flows ($v_n^{light}$,$v_n^{heavy}$) providing novel and powerful constraints for the transport coefficients. Finally, as recently recognized, very strong initial electro-magnetic (e.m.) fields are created in Ultra-relativistic Heavy-Ion Collision (HIC) that induce a vorticity in the reaction plane that is odd under charge exchange. We show within relativistic Boltzmann transport approach coupled with e.m. field that the strong initial e.m. field entails a transverse motion of both heavy quarks (HQ), resulting in a splitting of directed flow $v_1$ of D and anti-D mesons of few percent, that is much larger compared to the observed charged particles. Moreover, we discuss for both RHIC and LHC energies, the role played by the initial large bulk vorticity coming from the angular momentum conservation on the build up of rapidity odd HQ directed flow $v_1$.
[1] F. Scardina, S. K. Das, V. Minissale, S. Plumari, V. Greco, Phys.Rev. C96 (2017) no.4, 044905.
[2] S. K. Das, S. Plumari, S. Chatterjee, J. Alam, F. Scardina, V. Greco, Phys.Lett. B768 (2017) 260.
[3] S. K. Das, F. Scardina, S. Plumari, V. Greco, Phys.Lett. B747 (2015) 260.
[4] S. Plumari, G. L. Guardo, F. Scardina, V. Greco, Phys.Rev. C92 (2015) no.5, 054902.