Calculating quenching weights

被引:359
作者
Salgado, CA [1 ]
Wiedemann, UA [1 ]
机构
[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland
关键词
D O I
10.1103/PhysRevD.68.014008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We calculate the probability ("quenching weight") that a hard parton radiates an additional energy fraction DeltaE due to scattering in spatially extended QCD matter. This study is based on an exact treatment of a finite in-medium path length; it includes the case of a dynamically expanding medium, and it extends to the angular dependence of the medium-induced gluon radiation pattern. All calculations are done in the multiple soft scattering approximation [Baier-Dokshitzer-Mueller-Peigne-Schiff-Zakharov (BDMPSZ) formalism] and in the single hard scattering approximation [N=1 opacity approximation]. By comparison, we establish a simple relation between the transport coefficient, Debye screening mass and opacity, for which both approximations lead to comparable results. Together with this paper, a CPU-inexpensive numerical subroutine for calculating quenching weights is provided electronically. To illustrate its applications, we discuss the suppression of hadronic transverse momentum spectra in nucleus-nucleus collisions. Remarkably, the kinematic constraint resulting from finite in-medium path lengths reduces significantly the p(perpendicular to) dependence of the nuclear modification factor, thus leading to consistency with the data measured at the BNL Relativistic Heavy Ion Collider.
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页数:20
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