Sensitivity of Azimuthal Jet Tomography to Early Time Energy-Loss at RHIC and LHC

Abstract

We compute the jet path-length dependence of energy-loss for higher azimuthal harmonics of jet-fragments in a generalized model of energy-loss that can interpolate between pQCD and AdS/CFT limits and compare results with Glauber and CGC/KLN initial conditions. We find, however, that even the high-pT second moment is most sensitive to the poorly known early-time evolution during the first fm/c. Moreover, we demonstrate that quite generally the energy and density-dependence leads to an overquenching jet fragments relative to the first LHC $R_{AA}$-data, once the parameters of the energy-loss model are fixed from $R_{AA}$-data at RHIC.

4 pages, 2 figures, version accepted for publication in J. Phys. G: Nucl. Part. Phys. as conference proceedings for Quark Matter 2011, May 23 - May 28, Annecy, France

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• Azimuthal jet flavor tomography with CUJET2.0 of nuclear collisions at RHIC and LHC
• Examining a reduced jet-medium coupling in Pb+Pb collisions at the Large Hadron Collider
• Event-by-event azimuthal anisotropy of jet quenching in relativistic heavy ion collisions
• Hard Probe of Geometry and Fluctuations in Heavy Ion Collisions at $\sqrt{s_{{}_{NN}}}=$ 0.2, 2.76, and 5.5 TeV