Evidence for similar collectivity of high transverse momentum particles in pPb and PbPb collisions

Abstract

Charged hadron elliptic anisotropies ($v_2$) are presented over a wide transverse momentum ($p_{\text{T}}$) range for proton-lead (pPb) and lead-lead (PbPb) collisions at nucleon-nucleon center-of-mass energies of 8.16 and 5.02 TeV, respectively. The data were recorded by the CMS experiment and correspond to integrated luminosities of 186 nb${}^{-1}$ and 0.607 nb${}^{-1}$ for the pPb and PbPb systems, respectively. A four-particle cumulant analysis is performed using subevents separated in pseudorapidity to effectively suppress non-collective effects. At high $p_{\text{T}}$ ($p_{\text{T}}$ $>$ 8 GeV), significant positive $v_2$ values are observed that are similar between pPb and PbPb collisions at comparable charged particle multiplicities. This observation suggests a common origin for the multi-particle collectivity for high-$p_{\text{T}}$ particles in the two systems.

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-23-002 (CMS Public Pages)

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