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arXiv · 0912.2265

A Monte-Carlo model for elastic energy loss in a hydrodynamical background

Jussi Auvinen·Kari J. Eskola·Thorsten Renk
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Abstract

We present a computation of elastic energy loss of hard partons traversing the bulk hydrodynamical medium created in ultrarelativistic heavy-ion collisions. The model is based on perturbative Quantum Chromodynamics (pQCD) cross sections for $2\to 2$ processes in which a hard incoming parton is assumed to interact with a thermal parton from the medium. We model the interactions of this type in a Monte-Carlo framework to account properly for exact energy-momentum conservation, non-eikonal parton propagation, parton conversion reactions and the possibility to create additional hard recoiling partons from the medium. For the thermodynamical properties of the medium we use a hydrodynamical evolution model. We do not aim at a full description of high transverse momentum ($P_T$) observables at this point. Rather, we view the model as a starting point in obtaining a baseline of what to expect under the assumptions that the medium is describable by thermal quasifree partons and that their pQCD interactions with the high-energy partons are independent. Deviations from this baseline then call for more sophisticated medium description, as well as inclusion of higher-order processes and coherence effects in the pQCD scatterings.

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Jussi Auvinen, Kari J. Eskola, Thorsten Renk. 2009-12-11. A Monte-Carlo model for elastic energy loss in a hydrodynamical background. https://doi.org/10.1103/physrevc.82.024906

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