In-medium modification of dijets in PbPb collisions at ?sNN = 5.02 TeV

Abstract

Modifications to the distribution of charged particles with respect to high transverse momentum (p<inf>T</inf>) 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 sNN = 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<inf>j</inf> , which is the ratio between the subleading and leading jet p<inf>T</inf>. For events with x<inf>j</inf> ? 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. [Figure not available: see fulltext.] © 2021, The Author(s).