CMS-PAS-SMP-24-005

CMS-PAS-SMP-24-005
Measurement of the inclusive WZ production cross section in pp collisions at $\sqrt{s}=$ 13.6 TeV with the CMS experiment
CMS Collaboration
19 July 2024

Abstract: The inclusive WZ cross section is measured in proton-proton collisions at a centre-of-mass energy of 13.6 TeV, using 34.7 fb $^{-1}$ of data collected during 2022 with the CMS detector. The measurement is performed in multileptonic final states by performing a simultaneous likelihood fit to the number of events in four different lepton flavour categories: $\mathrm{eee}$ , $\mathrm{ee}{\mu}$ , ${\mu}{\mu}\mathrm{e}$ , ${\mu}{\mu}{\mu}$ . The selection is optimized to minimize the number of background events thanks to the usage of an efficient prompt lepton discrimination strategy. The WZ production cross section is measured in a phase space, defined around a 30 GeV window around the Z mass, as $\sigma_{\text{total}} (pp \rightarrow \mathrm{WZ}) =$ 55.2 $\pm$ 1.2 (stat) $\pm$ 1.2 (syst) $\pm$ 0.8 (lumi) $\pm$ 0.1 (theo) pb. In addition, the cross section is also measured in a fiducial phase space, closer to the detector level requirements, as $\sigma_{\text{fiducial}} (pp \rightarrow \mathrm{WZ}) =$ 297.6 $\pm$ 6.4 (stat) $\pm$ 6.4 (syst) $\pm$ 4.2 (lumi) $\pm$ 0.5 (theo) pb.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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