QCD corrections in Standard Model EFT fits to WZ and WW production

Baglio, Julien; Dawson, Sally; Homiller, Samuel

doi:10.1103/PhysRevD.100.113010

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 data recorded by the CMS experiment at the CERN LHC at center-of-mass energies

\sqrt{s} = 13

and 13.6 TeV, corresponding to an integrated luminosity of

200 {fb}^{- 1}

. Events with four charged leptons (electrons or muons) in the final state are selected. Both nonresonant

W W Z

production and

Z H

production, with the Higgs boson decaying into two

W

bosons, are reported. For the first time, the two processes are measured separately in a simultaneous fit. Combining the two modes, signal strengths relative to the standard model (SM) predictions of

{0.75}_{- 0.29}^{+ 0.34}

and

{1.74}_{- 0.60}^{+ 0.71}

are measured for

\sqrt{s} = 13

and 13.6 TeV, respectively. The observed (expected) significance for the triboson signal is 3.8 (2.5) standard deviations for

\sqrt{s} = 13.6 TeV

, thus providing the first evidence for triboson production at this center-of-mass energy. Combining the two modes and the two center-of-mass energies, the inclusive signal strength relative to the SM prediction is measured to be

{1.03}_{- 0.28}^{+ 0.31}

, with an observed (expected) significance of 4.5 (5.0) standard deviations.

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