Thermal and non-thermal charmed meson production in heavy ions collisions at the LHC

Abstract

The phenomenological analysis of the LHC data on pT-spectrum and elliptic flow of J/ψ and D mesons in PbPb collisions at √ sNN = 2.76 TeV is presented. The charmed meson production pattern in PbPb collisions may be reproduced by two-component model HYDJET++ including thermal and non-thermal components. The significant part of D-mesons is found to be in a kinetic equilibrium with the created medium, while J/ψ-mesons are not.

p T -spectra, nuclear modification factors (R AA , and R CP ) of (multi-) strange hadrons in Au+Au collisions at

“…1, and p T min = 3.55 for Au +Au collisions at s NN =200 GeV. The parameters are tuned in such way so that the nonstrange hadron spectra remain unchanged [5,6]. In addition, we have also tuned centralitydependent strangeness suppression factor (γ s ) to account for the possible non-equilibrium of strange quark in achieving chemical equilibrium [2,7,42].…”

“…In fact, an enhancement in the yield of strange hadrons in A+A collisions appropriately scaled by N coll compared to that in p+p collisions at the same energy serves as an important signal for the formation of QGP medium in A+A collisions [1]. Multi-strange hadrons (especially Ξ and Ω) [2] have small hadronic cross-sections and an early hadronization compared to non-strange hadrons [3][4][5][6][7][8][9], therefore, revealing valuable information about the partonic stage rather than the hadronic stage of the medium evolution.…”