  We present an attempt to probe the underlying structure of the quark-gluon
plasma (QGP) at high resolution, based on the extracted jet transport
coefficient $\hat{q}$. We argue that the exchanged momentum $k$ between the
hard parton and the medium varies over a range of scales, and for $k\geq$ 1
GeV, $\hat{q}$ can be expressed in terms of a parton distribution function
(PDF). Because the mass of a QGP constituent is unknown, we define a scaling
variable $x_N$ to represent the ratio of the parton momentum to the momentum of
a self-contained section of the plasma which has a mass of 1 GeV. This scaling
variable is used to parametrize the QGP-PDF. Calculations, based on this
reconstructed $\hat{q}$ are compared to data sensitive to the hardcore of jets
$i.e.,$ the 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 $p_{\mathrm{T}}$, centrality and energy of the
collision. It is demonstrated that the scale evolution of the QGP-PDF is
responsible for the reduction in the normalization of $\hat{q}$ between fits to
Relativistic Heavy-Ion Collider (RHIC) and Large Hadron Collider (LHC) data; a
puzzle, first discovered by the JET collaboration.
