CMS-PAS-SMP-24-015

CMS-PAS-SMP-24-015
Measurement of WWZ and ZH cross sections at $ \sqrt{s}= $ 13 and 13.6 TeV in the four-lepton channel with the CMS detector
CMS Collaboration
3 March 2025

Abstract: A measurement is presented of the cross section in proton-proton collisions for the production of two W bosons and one Z boson. It is based on a data recorded by the CMS experiment at the CERN LHC at center-of-mass energies $ \sqrt{s} $=13 and 13.6 TeV, and corresponding to an integrated luminosity of 200 fb$ ^{-1} $. Events with four leptons (electrons or muons) in the final state are selected. Both non-resonant WWZ production and ZH production, with the Higgs boson decaying to two W bosons, are considered. For the first time, the two processes are measured simultaneously. Signal strengths relative to the standard model (SM) predictions of 0.75 $ ^{+0.34}_{-0.29} $ and 1.74 $ ^{+0.71}_{-0.60} $ are measured for $ \sqrt{s} $=13 and 13.6 TeV respectively. The observed (expected) significance for the tri-boson signal is found to be 3.83 (2.49) standard deviations for $ \sqrt{s} $=13 TeV, thus providing the first evidence at this center-of-mass energy. Taking all data together, the signal strength relative to the SM prediction is measured to be 1.03 $ ^{+0.31}_{-0.28} $, with an observed (expected) significance of 4.53 (5.04) standard deviations.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here.

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