An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum ( (p_{T}) ) surrounding dijet systems is measured by selecting charged particles in different ranges of (p_{T}) and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the (p_{T}) asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-(k_{T}) jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the (p_{T}) imbalance compensated by an excess of low- (p_{T}) particles at large angles from the jet axes.