CMS-PAS-HIN-24-008

CMS-PAS-HIN-24-008
Jet shapes based on two-particle angular correlations in PbPb collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.02 TeV
CMS Collaboration
8 October 2024

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 nb$^{-1}$. Proton-proton collision data at the same nucleon-nucleon collision energy and corresponding to 252 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.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.

CMS Publications