Abstract:
Modifications to the distribution of charged particles with respect to high
transverse momentum (pT) 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 p
sNN = 5.02TeV 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 xj , which is the ratio between the subleading
and leading jet pT. For events with xj 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.
