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The nuclear modification factor R_{AA} measured in Pb+Pb collisions at theLarge Hadron Collider (LHC) suggests that the jet-medium coupling in aQuark-Gluon Plasma at LHC energies is reduced as compared to energies reachedat the Relativistic Heavy Ion Collider (RHIC). We estimate the reduction factorusing a simple generic energy-loss model and find that the jet-medium couplingat the LHC is approximately 10% smaller than at RHIC. Moreover, we examinedifferent jet-energy loss prescriptions with $dE/dx\sim E^a$ and show that themeasured momentum dependence of the nuclear modification factor at the LHCrules out any model with $E^{a>1/3}$.

Quantifying a Possibly Reduced Jet-Medium Coupling of the sQGP at the LHC