  We present the first global extraction of the jet transport coefficient
($\hat q$) for cold nuclear matter within the framework of higher-twist
expansion. The analysis takes into account the world data on transverse
momentum broadening in semi-inclusive $e$-A deep inelastic scattering (DIS) and
in Drell-Yan dilepton and heavy quarkonium production in $p$-A collisions, as
well as the nuclear modification of the structure functions in DIS. The results
of this work provide the first quantitative evidence for the universality and
non-trivial scale dependence of the medium transport property, similar to that
for nucleon structure as encoded in the standard parton distribution functions.
We expect the extracted scale dependence of $\hat q$ for cold nuclear matter
can be extended to precisely identify the fundamental property of quark gluon
plasma.
