  Tagged jet measurements provide a promising experimental channel to quantify
the similarities and differences in the mechanisms of jet production in
proton-proton and nucleus-nucleus collisions. We present the first calculation
of the transverse momentum asymmetry of Z^0/gamma^*-tagged jet events in
sqrt{s}=2.76$ TeV reactions at the LHC. Our results combine the
O(G_F\alpha_s^2) perturbative cross sections with the radiative and collisional
processes that modify parton showers in the presence of dense QCD matter. We
find that a strong asymmetry is generated in central lead-lead reactions that
has little sensitivity to the fluctuations of the underlying soft hadronic
background. We present theoretical model predictions for its shape and
magnitude.
