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

被引:42
作者
Auvinen, Jussi [1 ]
Eskola, Kari J.
Renk, Thorsten
机构
[1] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland
来源
PHYSICAL REVIEW C | 2010年 / 82卷 / 02期
关键词
QUARK; DISTRIBUTIONS; COLLISIONS; PARTONS;
D O I
10.1103/PhysRevC.82.024906
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
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 QCD (pQCD) cross sections for 2 -> 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, noneikonal 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 (PT) 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 a more sophisticated medium description, as well as inclusion of higher-order processes and coherence effects in the pQCD scatterings.
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页数:11
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