Abstract
We show that the low-pT data and high-pT data from RHIC and LHC give a contradictory picture of the relevant dynamics of a quark-gluon plasma. While the bulk observables imply a strongly coupled fluid best described by AdS/CFT the rare probes imply a weakly coupled gas best described using thermal pQCD. These conclusions are based on leading order theoretical calculations, and we speculate that more sophisticated calculations that include higher order effects might provide a resolution to the current puzzle.
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