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By using the AdS/CFT correspondence we study the deep inelastic scattering ofan R-current off a N=4 supersymmetric Yang-Mills (SYM) plasma at finitetemperature and strong coupling. Within the supergravity approximation validwhen the number of colors is large, we compute the structure functions bysolving Maxwell equations in the space-time geometry of the AdS_5 blackthree-brane. We find a rather sharp transition between a low energy regimewhere the scattering is weak and quasi-elastic, and a high-energy regime wherethe current is completely absorbed. The critical energy for this transitiondetermines the plasma saturation momentum in terms of its temperature T and theBjorken x variable: Q_s=T/x. These results suggest a partonic picture for theplasma where all the partons have transverse momenta below the saturationmomentum and occupation numbers of order one.

Deep inelastic scattering off a N=4 SYM plasma at strong coupling