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

Abstract

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

4 pages, 2 figures, accepted for publication in Nuclear Physics A as conference proceedings for Quark Matter 2012

References in corpus (4)

• Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Neutral pion production with respect to centrality and reaction plane in Au+Au collisions at sqrt(s_NN)=200 GeV
• Angular Dependence of Jet Quenching Indicates Its Strong Enhancement Near the QCD Phase Transition
• Gluon energy loss in the gauge-string duality

Cited by in corpus (3)

• Azimuthal jet flavor tomography with CUJET2.0 of nuclear collisions at RHIC and LHC
• Hard Probe of Geometry and Fluctuations in Heavy Ion Collisions at $\sqrt{s_{{}_{NN}}}=$ 0.2, 2.76, and 5.5 TeV
• Investigation of Hot QCD Matter: Theoretical Aspects