An AdS/CFT Calculation of Screening in a Hot Wind
Hong Liu, Krishna Rajagopal, Urs Achim Wiedemann
Abstract
One of the challenges in relating experimental measurements of the suppression in the number of J/ψmesons produced in heavy ion collisions to lattice QCD calculations is that whereas the lattice calculations treat J/ψmesons at rest, in a heavy ion collision a c c pair can have a significant velocity with respect to the hot fluid produced in the collision. The putative J/ψfinds itself in a hot wind. We present the first rigorous non-perturbative calculation of the consequences of a wind velocity v on the screening length Ls for a heavy quark-antiquark pair in hot N=4 supersymmetric QCD. We find Ls(v,T) = f(v)[1-v2]1/4/πT with f(v) only mildly dependent on v and the wind direction. This Ls(v,T) Ls(0,T)/γ velocity scaling, if realized in QCD, provides a significant additional source of J/Ψsuppression at transverse momenta which are high but within experimental reach.
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