We present our latest results in the study of momentum imbalance as a function of jet asymmetry in high-energy heavy-ion collisions. We have included all leading order (LO) 2->2 and 2->3 parton processes in pQCD. The produced partons lose energy within the QGP and hadronize collinearly when they leave it. The energy and momentum deposited into the plasma is described using linear viscous hydrodynamics. We find that the shape of the asymmetry observed by the CERN-CMS Collaboration can indeed be attributed to parton energy loss in the medium and that a good description of data is achieved when one includes a slight enhancement coming from the contribution of 2->3 parton processes that modifies the asymmetry distribution of the dijet events.