CERN Accelerating science

Article
Title	Impact of Glasma on heavy quark $R_{AA}$ and $v_2$ in nucleus-nucleus collisions at LHC
Author(s)	Sun, Y (INFN, LNS) ; Coci, G (INFN, LNS ; Catania, CSFNSM ; Catania U.) ; Das, S K (Indian Inst. Tech. Goa) ; Plumari, S (INFN, LNS ; Catania U.) ; Ruggieri, M (Lanzhou U.) ; Greco, V (INFN, LNS ; Catania U.)
Publication	2021
Number of pages	4
In:	Nucl. Phys. A 1005 (2021) 121913
In:	The 28th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Wuhan, China, 3 - 9 Nov 2019, pp.121913
DOI	10.1016/j.nuclphysa.2020.121913
Subject category	Nuclear Physics - Theory ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CERN LHC
Abstract	We study the effect of the strong quasi-classical gluon field produced in the pre-thermal equilibrium stage of ultra-relativistic heavy ion collisions (RHICs) on the evolution of heavy quarks. It is shown that this field leads to an initial enhancement of the nuclear modification factor ($R_{AA}$) of charm quarks at large $p_T$ . After the further evolution in the QGP phase, we find a larger interaction strength, which is necessary to obtain the $R_{AA}$ measured in experiments, compared to the standard drag and diffusion dynamics without the inclusion of this pre-thermal equilibrium stage. Moreover, we find a larger final elliptic flow $\nu_2$ is obtained, that is quite close to the experimental measurements.
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