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