Speaker
Description
The collective behavior of \ensuremath{\mathrm{K^0_S}} and \ensuremath{\Lambda}/\ensuremath{\bar{\Lambda}} strange hadrons is studied using the scalar-product and multiparticle correlation methods. Proton-lead (pPb) collisions at the nucleon-nucleon center-of-mass energy $\sqrt{s_{\mathrm{NN}}} =$ 8.16 TeV and lead-lead (PbPb) collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV are investigated. The data samples were collected by the CMS experiment at the LHC. Nonflow effects in the pPb collisions are investigated by a subevent cumulant analysis and by excluding events where a jet with transverse momentum greater than 20 GeV is present. The jet exclusion study allows for a quantitative estimate of the dijet contribution to higher-order cumulants in the pPb system. For the first time, the collectivity of strange particles is observed in pPb collisions. A comparison of the pPb and PbPb results for both strange particles and charged hadrons shows how event-by-event flow fluctuations are affected by the system size.
