The VII-th International Conference on the Initial Stages of High-Energy Nuclear Collisions : Initial Stages 2023

Effect of initial state on high-$p_T$ $v_2$, $v_3$, and $v_4$ in a dynamical energy loss framework

Not scheduled

20m

Copenhagen

Poster The initial stages and nuclear structure in heavy-ion collisions

Speaker

Jussi Auvinen (University of Jyvaskyla)

Description

We investigate the nuclear modification factor $R_{AA}$ and $v_2$, $v_3$, and $v_4$ for high transverse momentum charged particles and $D$ and $B$ mesons for 5 TeV $Pb$+$Pb$ collisions in the LHC [1]. The suppression of high-$p_T$ particles is calculated using DREENA-A dynamical energy loss formalism, while for the event-by-event bulk evolution we utilize three different initializations: 1) Monte Carlo Glauber with the start time of the hydrodynamical evolution set to $\tau_0 = 1.0$ fm, 2) Trento using the generalized mean parameter p = 0 combined with free streaming until $\tau_0 = 1.16$ fm, and 3) IP-Glasma at $\tau_0 = 0.4$ fm. We find that the three initializations lead to notably different values of high-$p_T$ $v_2$ and $v_3$, while $v_4$ is very close to $0$ in all three cases. This presents a potential "high-$p_T$ $v_4$ puzzle" should the future measurements confirm nonzero $v_4$ for charged particles at $p_T > 30$ GeV.

References:
[1] D. Zigic, J. Auvinen, I. Salom, M. Djordjevic, and P. Huovinen, Phys. Rev. C 106, 044909 (2022), arXiv:2208.09886 [hep-ph].