Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-06-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at Quark Matter 2011, 22-28 May 2011, Annecy, France
Scientific paper
Despite a wealth of experimental data for high-P_T processes in heavy-ion collisions, discriminating between different models of hard parton-medium interactions has been difficult. A key reason is that the pQCD parton spectrum at RHIC is falling so steeply that distinguishing even a moderate shift in parton energy from complete parton absorption is essentially impossible. In essence, energy loss models are effectively only probed in the vicinity of zero energy loss and, as a result, at RHIC energies only the pathlength dependence of energy loss offers some discriminating power. At LHC however, this is no longer the case: Due to the much flatter shape of the parton p_T spectra originating from 2.76 AGeV collisions, the available data probe much deeper into the model dynamics. A simultaneous fit of the nuclear suppression at both RHIC and LHC energies thus has great potential for discriminating between various models that yield equally good descriptions of RHIC data alone.
Auvinen Jussi
Eskola Kari. J.
Heinz Ulrich
Holopainen Hannu
Paatelainen Risto
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