Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at s N N = 2.76 √s_NN=2.76 TeV

2015/09/30 by V. Khachatryan, CMS Collaboration, A. M. Sirunyan +98 · 3 citations
Physics and Astronomy · #Astronomy #Asymmetry #Azimuth #Charged particle #High-Energy Particle Collisions Research #Jet (fluid) #Large Hadron Collider #Multiplicity (mathematics) #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #Quark #Quark–gluon plasma #Transverse plane #hep-ex #nucl-ex

paper · pdf · doi:10.1007/jhep01(2016)006

published as JHEP 01 (2016) 006 · Replaced with published version. Added journal reference and DOI

openalex publication_date 2016/01/01 · arxiv created 2016/02/12 · arxiv updated 2016/02/15 · openalex created_date 2017/05/12 · openalex updated_date 2026/08/06

Abstract

An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p T ) surrounding dijet systems is measured by selecting charged particles in different ranges of p T and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the p T asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-k T jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the p T imbalance compensated by an excess of low-p T particles at large angles from the jet axes.

Citations

• Measurement of isolated photon production in pp and PbPb collisions at sNN=2.76 TeV
• Angular Structure of the In-Medium QCD Cascade
• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at √s_NN = 2.76 TeV
• Singular value decomposition and least squares solutions
• The anti-ktjet clustering algorithm
• JET PHYSICS IN HEAVY-ION COLLISIONS
• Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at sNN=2.76 TeV
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √s= 8 TeV
• Studies of jet quenching using isolated-photon + jet correlations in PbPb and pp collisions at sNN=2.76 TeV

Cited by

• Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sNN=5.02 TeV
• First measurement of large area jet transverse momentum spectra in heavy-ion collisions
• Heavy-ion collisions at the Large Hadron Collider: A review of the results from Run 1