  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 using the CMS detector. Back-to-back dijets are analyzed in
lead-lead and proton-proton collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV via
correlations of charged particles in bins of relative pseudorapidity and
angular distance from the leading and subleading jet axes. In comparing the
lead-lead and proton-proton collision results, modifications to the
charged-particle relative distance distribution and to the momentum
distributions around the jet axis are found to depend on the dijet momentum
balance $x_j$, which is the ratio between the subleading and leading jet
$p_\mathrm{T}$. For events with $x_j \approx 1$, these modifications are
observed for both the leading and subleading jets. However, while subleading
jets show significant modifications for events with a larger dijet momentum
imbalance, much smaller modifications are found for the leading jets in these
events.
