In this Letter, the exact accelerating string solution of a heavy quark-antiquark pair is found in AdS(5) space. On the accelerating string, there is a particular scale which separates the radiation and the heavy quark. This scale is explicitly shown to be an event horizon in the proper frame of the heavy quark. Furthermore, we find a new correspondence, which relates the horizon in AdS(5) space on the gravity theory side to the Unruh temperature in Minkowski space on the field theory side of the AdS/CFT correspondence. p(perpendicular to)-broadening and P-L-broadening of the heavy quark due to radiation are computed using the AdS/CFT correspondence. (C) 2008 Elsevier B.V. All rights reserved.
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