Jet shapes based on two-particle angular correlations in PbPb collisions at $\sqrt{{s}_{\rm NN}}$ = 5.02 TeV

CMS Physics Analysis Summaries
Report number	CMS-PAS-HIN-24-008
Title	Jet shapes based on two-particle angular correlations in PbPb collisions at $\sqrt{{s}_{\rm NN}}$ = 5.02 TeV
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	In ultrarelativistic heavy ion collisions, long- and short-range correlations can be studied by forming two-dimensional histograms of the separations in pseudorapidity and azimuth of each particle in an event with every other particle in that event, with the two particles forming a pair selected in specified transverse-momentum ranges. Averaged over many events, jets result in a well defined peak structure centered at zero separation in pseudorapidity and azimuth. This note explores the evolution of the two-particle jet peak shape with the pair transverse momentum ranges, the collision centrality, and the pseudorapidity of the jet peak. Lead-lead collision results at a center-of-mass energy per nucleon pair of 5.02 TeV are presented. The data were obtained using the CMS detector and correspond to an integrated luminosity of $0.607~\mathrm{nb}^{-1}$. Proton-proton collision data at the same nucleon-nucleon collision energy and corresponding to $252~\mathrm{nb}^{-1}$ are also presented to provide a vacuum reference. The results are discussed in terms of the boost invariance of the two-particle correlation jet peak shape.
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