Strange hadron collectivity in pPb and PbPb collisions

The CMS collaboration, The CMS collaboration

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The collective behavior of KS0 and Λ/Λ¯ strange hadrons is studied by measuring the elliptic azimuthal anisotropy (v2) using the scalar-product and multiparticle correlation methods. Proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy sNN = 8.16 TeV and lead-lead (PbPb) collisions at sNN = 5.02 TeV collected by the CMS experiment at the LHC are investigated. Nonflow effects in the pPb collisions are studied by using a subevent cumulant analysis and by excluding events where a jet with transverse momentum greater than 20 GeV is present. The strange hadron v2 values extracted in pPb collisions via the four- and six-particle correlation method are found to be nearly identical, suggesting the collective behavior. Comparisons of the pPb and PbPb results for both strange hadrons and charged particles illustrate how event-by-event flow fluctuations depend on the system size.

Original languageEnglish (US)
Article number7
JournalJournal of High Energy Physics
Issue number5
StatePublished - May 2023

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Collective Flow
  • Hadron-Hadron Scattering


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