Speaker
Santosh Kumar Das
(University of Catania, Italy)
Description
We address the difficulties of the present theoretical approaches to have a
self-consistent description of the experimental data at both RHIC and LHC.
In particular a puzzling relation between the nuclear modification factor
$R_{AA}(p_T)$ and the elliptic flow $v_2(p_T)$ related to heavy quark has been
observed which challenged existing models. We discuss, comparing different
models and approaches, how the temperature dependence of the heavy quark drag
coefficient and/or the $\hat{q}$ can account for a large part of such a puzzle.
We point out that for the same $R_{AA}(p_T)$ one can generate 2-3 times more $v_2$ depending on the
temperature dependence of the heavy quark drag coefficient. We discuss
how the $R_{AA}(p_T)$ and $v_2(p_T)$ tension can be further improve by means
of a comparison in between the full solution of the Boltzmann collision
integral
with the Fokker-Planck equation. We highlight the impact of radiation as
well as
external magnetic field on heavy quark $R_{AA}(p_T)$ and $v_2(p_T)$.
[1] S. K. Das, F. Scardina, S. Plumari, V.Greco Phys.Rev. C90 (2014) 044901
[2] S. K. Das, F. Scardina, S. Plumari, V.Greco, Phys.Lett. B747 (2015) 260-264
| On behalf of collaboration: | None |
|---|
Primary author
Santosh Kumar Das
(University of Catania, Italy)
Co-authors
Salvatore Plumari
(University of Catania (Italy))
francesco scardina
(INFN Catania)
