  We present a brief report on a thought experiment in which an incident
energetic parton traverses a brick of quark-gluon plasma (QGP), see
arXiv:1808.03250 for the full report. We calculate the probability of detecting
a parton showing up at a large angle with respect to its initial direction due
to scattering with the constituents of QGP, using leading order perturbative
QCD. We include all relevant channels, including the Rutherford-like channel as
considered in early works, and those that are not Rutherford-like but become
important at a large angle. The resulting probability distributions contain
information about the short distance structure of QGP. Our results provide key
theoretical input toward finding the scatterers within the QGP liquid, which in
turn is the necessary first step toward using precise, high-statistics,
suitably differential measurements of jet modification in heavy ion collisions
to study the evolution of the properties of QGP with changing resolution scale.
