  Hard probes are a cornerstone in the ongoing program to determine the
properties of hot and dense QCD matter as created in ultrarelativistic heavy
ion collisions. LHC measurements have so far resulted in a wealth of high P_T
data, opening new kinematic windows with high statistics. Yet on first glance,
several observations are counter-intuitive and seem to contradict results from
the RHIC high P_T program. This calls for a combined analysis of high P_T
hadrons and reconstructed jets at RHIC and LHC in a unified framework testing a
large number of theoretical models for both medium evolution and shower medium
interactions against the systematics of the data. A consistent picture of
shower-medium interaction emerges from this analysis which explains where and
why results appear counter-intuitive.
