Study of in-medium modification of dijets in PbPb collisions at 5.02 TeV

Modifications to the distribution of charged particles with respect to high transverse momentum $(p_{\mathrm{T}})$ jets passing through a quark-gluon plasma are explored. Jets corresponding to dijet selection where the leading and subleading jets are back-to-back are studied in lead-lead (PbPb) and proton-proton (pp) collisions. Correlations of charged particles are measured in relative pseudorapidity and relative azimuth from the jet axes. Jet momentum density profiles (``jet shapes") are determined. The events are categorized in bins of collision centrality, charged particle $p_{\mathrm{T}}$ and dijet momentum balance $x_{j}$, which is the ratio between the subleading and leading jet $p_{\mathrm{T}}$. In comparing the PbPb and pp collision results, modifications to the charged particle yields is found to depend on the $x_{j}$ value. Modifications to both the charged-particle pseudorapidity dependence and the jet momentum density profile are observed to be greater for the leading jet in more momentum balanced conditions. The modifications become more pronounced with respect to the subleading jet for events with a larger dijet momentum imbalance.