In-medium modification of dijets in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

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.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-013 (CMS Public Pages)

References in corpus (41)

• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Parton distributions from high-precision collider data
• Particle-flow reconstruction and global event description with the CMS detector
• Heavy Ion Collisions: The Big Picture, and the Big Questions
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN))= 2.76 TeV with the ATLAS Detector at the LHC
• Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• Performance of the CMS Level-1 trigger in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV
• Direct observation of dijets in central Au+Au collisions at sqrt(s_NN) = 200 GeV
• Charged-particle nuclear modification factors in PbPb and pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Modification of jet shapes in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Jet Shapes with the Broadening Axis
• Measurement of jet fragmentation in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Heavy ion event generator HYDJET++ (HYDrodynamics plus JETs)
• Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector
• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Dependence on pseudorapidity and centrality of charged hadron production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV
• Angular Structure of Jet Quenching Within a Hybrid Strong/Weak Coupling Model
• Full jet in quark-gluon plasma with hydrodynamic medium response
• Jet Observables Without Jet Algorithms
• Particle-level pileup subtraction for jets and jet shapes
• Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter
• Angular structure of the in-medium QCD cascade
• Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• An analysis of the influence of background subtraction and quenching on jet observables in heavy-ion collisions
• A Theoretical Assessment of Jet-Hadron Correlations
• Jet properties in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Jet asymmetry and momentum imbalance from $2\to 2$ and $2\to 3$ partonic processes in relativistic heavy-ion collisions
• Event-by-event fluctuations in the medium-induced jet evolution

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• Jet radius dependence of dijet momentum balance and suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• Jet-like correlations with respect to K${}_{\mathrm{S}}^0$ and $\Lambda$ ($\bar{\Lambda }$) in pp and central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
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• Observation of the jet diffusion wake using dijets in heavy ion collisions
• Studying the QGP with Jets at the LHC and RHIC
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