Leading-particle suppression in high energy nucleus-nucleus collisions
Universitá degli Studi di Padova and INFN, via Marzolo 8, 35131, Padova, Italy
2 Institut für Kernphysik, August-Euler-Str. 6, 60486, Frankfurt am Main, Germany
3 Instituto de Ciencias Nucleares, UNAM, Mexico City, Mexico
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Parton energy loss effects in heavy-ion collisions are studied with the Monte Carlo program PQM (Parton Quenching Model) constructed using the BDMPS quenching weights and a realistic collision geometry. The merit of the approach is that it contains only one free parameter that is tuned to the high-p t nuclear modification factor measured in central Au-Au collisions at GeV. Once tuned, the model is consistently applied to all the high-p t observables at 200 GeV: the centrality evolution of the nuclear modification factor, the suppression of the away-side jet-like correlations, and the azimuthal anisotropies for these observables. Predictions for the leading-particle suppression at nucleon-nucleon centre-of-mass energies of 62.4 and 5500 GeV are presented. The limits of the eikonal approximation in the BDMPS approach, when applied to finite-energy partons, are discussed.
© Springer-Verlag, 2005