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 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 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.
Highlights
Events are selected with nearly back-to-back (∆φ > 5π/6), high-pT leading and subleading jet pairs
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
Within the solenoid volume are a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter (HCAL), each composed of barrel and two endcap sections
Summary
Events are selected with nearly back-to-back (∆φ > 5π/6), high-pT leading and subleading jet pairs. Comparing the different xj bins for the subleading jets, the enhancement of the total PbPb yield relative to the pp yield is seen to slightly decrease as the dijet momenta become more balanced.
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