CMS-PAS-HIN-21-012

CMS-PAS-HIN-21-012
Correlations between multiparticle cumulants and mean transverse momentum in small collision systems with the CMS detector
CMS Collaboration
April 2022

Abstract: Correlations between multiparticle cumulants and mean transverse momentum in proton-proton (pp), proton-lead (pPb) and peripheral lead-lead (PbPb) collisions are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 28.6 pb$^{-1}$ for pp at $\sqrt{s}= $ 13 TeV, 186 nb$^{-1}$ for pPb at $\sqrt{s_{_{\mathrm{NN}}}}= $ 8.16 TeV, and 0.58 nb$^{-1}$ for PbPb at $\sqrt{s_{_{\mathrm{NN}}}}= $ 5.02 TeV, were collected using the CMS detector at the LHC. Modified Pearson correlation coefficients of charged particles are measured to characterize these events. The two- and four-particle cumulants for the second- and third-order Fourier harmonics are correlated with mean transverse momentum on an event-by-event basis. Sign changes are observed as a function of multiplicity when using two-particle cumulants in pp and pPb systems. The sign changes disappear as pseudorapidity gaps between the two subevents increase. Predictions based on color-glass condensate and hydrodynamic models are compared to the experimental results.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here.

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