Abstract
Measurements of production cross sections of WZ and same-sign WW boson pairs in association with two jets in proton-proton collisions at s=13TeV at the LHC are reported. The data sample corresponds to an integrated luminosity of 137fb−1, collected with the CMS detector during 2016–2018. The measurements are performed in the leptonic decay modes ▪ and ▪, where ℓ,ℓ′=e, ▪. Differential fiducial cross sections as functions of the invariant masses of the jet and charged lepton pairs, as well as of the leading-lepton transverse momentum, are measured for W±W± production and are consistent with the standard model predictions. The dependence of differential cross sections on the invariant mass of the jet pair is also measured for WZ production. An observation of electroweak production of WZ boson pairs is reported with an observed (expected) significance of 6.8 (5.3) standard deviations. Constraints are obtained on the structure of quartic vector boson interactions in the framework of effective field theory.
Highlights
The observation of a Higgs boson with a mass of about 125 GeV [1,2,3] established that the W andZ gauge bosons acquire mass via the Brout–Englert–Higgs mechanism [4,5,6,7,8,9]
The nonprompt lepton backgrounds originating from leptonic decays of heavy quarks, hadrons misidentified as leptons, and electrons from photon conversions are suppressed by the identification and isolation requirements imposed on electrons and muons
The production cross sections of WZ and same-sign WW boson pairs in association with two jets are measured in proton-proton collisions at a center-of-mass energy of 13 TeV
Summary
The observation of a Higgs boson with a mass of about 125 GeV [1,2,3] established that the W and. They are part of a class of processes contributing to diboson plus two jets production that proceeds via the EW interaction, referred to as EW-induced diboson production, at tree level, O(α4), where α is the EW coupling. The ATLAS and CMS Collaborations reported observations of the EW W±W± production at 13 TeV with a significance greater than 5 standard deviations using the data collected in 2016, corresponding to integrated luminosities of approximately 36 fb−1. Refs. [27, 28]
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