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We present the first attempt to extract the "$x$" dependence of the partondistribution function (PDF) of the quark gluon plasma (QGP). In the absence ofknowledge regarding the mass of a QGP constituent, we define the new variable$x_N$, the nucleonic momentum fraction, which represents the ratio of themomentum of the parton to that of a self-contained section of the plasma thathas the mass of a nucleon. Calculations are compared to data for single hadronsuppression in terms of the nuclear modification factor $R_{AA}$ and theazimuthal anisotropy parameter $v_{2}$, as a function of transverse momentum$p_{T}$, centrality and energy of the collision. It is demonstrated that thescale evolution of the QGP-PDF is responsible for the reduction innormalization of the jet transport coefficient $\hat{q}$, between fits toRelativistic Heavy-Ion Collider (RHIC) and Large Hadron Collider (LHC) data; apuzzle, first discovered by the JET collaboration. Best fits to data aresuggestive of the presence of quasi-particles with wide dispersion relations inthe QGP.

The $x$ and $Q^2$ dependence of $\hat{q}$, quasi-particles and the JET puzzle