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.

Strange hadron collectivity in pPb and PbPb collisions

Albergo S.
Membro del Collaboration Group
;
Costa S.
Membro del Collaboration Group
;
Potenza R.
Membro del Collaboration Group
;
Tricomi A.
Membro del Collaboration Group
;
Tuve C.
Membro del Collaboration Group
;
2023-01-01

Abstract

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.
2023
Collective Flow, Hadron-Hadron Scattering
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/718015
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