Strange hadron collectivity in pPb and PbPb collisions
(2023) Journal of High Energy Physics — Vol. 05 (2023)
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- The collective behavior of $ {\textrm{K}}_{\textrm{S}}^0 $ and $ \Lambda /\overline{\Lambda} $ strange hadrons is studied by measuring the elliptic azimuthal anisotropy (v$_{2}$) using the scalar-product and multiparticle correlation methods. Proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy $ \sqrt{s_{\textrm{NN}}} $ = 8.16 TeV and lead-lead (PbPb) collisions at $ \sqrt{s_{\textrm{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 v$_{2}$ 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.[graphic not available: see fulltext]
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Benecke, A., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T. T., Vischia, P., et al. (2023). Strange hadron collectivity in pPb and PbPb collisions. Journal of High Energy Physics, 05. https://doi.org/10.1007/JHEP05(2023)007 (Original work published 2023)