Strange hadron collectivity in pPb and PbPb collisions



The collective behavior of K
S 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
NN = 8.16 TeV and lead-lead (PbPb) collisions at √s
NN = 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.
Date made available20 May 2022


  • hep-ex


  • Format
  • Strange hadron collectivity in pPb and PbPb collisions

    CMS Collaboration, 2 May 2023, In: JHEP. 2023, 5, 43 p., 7.

    Research output: Contribution to journalArticlepeer-review

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