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κL $^{2}$ˆ q log( p$_{T}$ /M$_{Q}$ ) /p$_{T}$ , with κ a proportionality constant and ˆ q = µ 2 $_{D}$/λ$_{g}$ . The most important feature in pQCD relative to AdS/CFT is that ¯ ϵ$_{pQCD}$ → 0 asymptotically at high- p$_{T}$ while ¯ ϵ$_{AdS}$ remains constant. n$_{Q}$ ( p$_{T}$ ) is a slowly increasing function of momentum, Fig. 5.4; thus R pQCD AA increases with p$_{T}$ whereas R AdS AA decreases. This generic difference can be observed in Fig. 5.2, which shows representative predictions from the full numerical calculations of 

