Updated analysis of jet quenching at RHIC and LHC within the light cone path integral approach

Abstract

We present results of a detailed analysis of experimental data on the nuclear modification factor $R_{AA}$ and the flow coefficient $v_2$ for light hadrons from RHIC for $0.2$ TeV Au+Au collisions and from LHC for $2.76$ and $5.02$ TeV Pb+Pb, and $5.44$ TeV Xe+Xe collisions. We perform calculations within the light-cone path integral approach to induced gluon emission. We use running ${\alpha }_s$ which is frozen at low momenta at some value ${\alpha }_s^{fr}$. We find that the RHIC data support somewhat larger value of ${\alpha }_s^{fr}$. For the ${\chi }^2$ optimized values of ${\alpha }_s^{fr}$, the theoretical predictions are in reasonable agreement with data on $R_{AA}$ and $v_2$. Calculations made for different formation times and life-times of the QGP show that jet quenching at the RHIC and LHC energies is only weakly sensitive to the initial and final stages of the QCD matter evolution.

arXiv comment26 pages, 12 figures. Accepted in J.Phys. G

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