Abstract:
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.
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