Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solving the $\hat{q}$ puzzle with $x$ and scale dependence   We present here a possible resolution of the jet quenching parameter
$\hat{q}$ puzzle by exploring the momentum fraction $x$ and scale $Q^2$
dependence of $\hat{q}$, in addition to temperature dependence. We explore the
momentum broadening of the jet due to Glauber gluon exchange with the
quark-gluon plasma (QGP). This has led us to define the momentum fraction $x$
for the partons in the QGP. We also show here, for the first time, possible
forms of the parton distribution function (PDF) of the QGP. The QGP-PDF as
input in $\hat{q}$ has been used to fit the PHENIX and CMS data simultaneously.
We observe that the scale evolution of the QGP-PDF and the energy of the jet
are the missing ingredients responsible for the enhancement of $\hat{q}$ at the
same temperature in RHIC collisions compared to LHC collisions.

1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom