Abstract
A study of vector boson scattering in pp collisions at a center-of-mass energy of 8 TeV is presented. The data sample corresponds to an integrated luminosity of 19.4 fb(-1) collected with the CMS detector. Candidate events are selected with exactly two leptons of the same charge, two jets with large rapidity separation and high dijet mass, and moderate missing transverse energy. The signal region is expected to be dominated by electroweak same-sign W-boson pair production. The observation agrees with the standard model prediction. The observed significance is 2.0 standard deviations, where a significance of 3.1 standard deviations is expected based on the standard model. Cross section measurements for W(±)W(±) and WZ processes in the fiducial region are reported. Bounds on the structure of quartic vector-boson interactions are given in the framework of dimension-eight effective field theory operators, as well as limits on the production of doubly charged Higgs bosons.
Highlights
Vector boson scattering (VBS) and quartic boson couplings are features of the standard model (SM) that remain largely unexplored by the LHC experiments
The Higgs boson observed by the LHC experiments may restore the unitarity, some scenarios of physics beyond the SM predict enhancements for VBS through modifications to the Higgs sector or the presence of additional resonances [6,7]. pffiTffi his Letter presents a study of VBS in pp collisions at s 1⁄4 8 TeV
The study of VBS presented here leads to measurements of the production cross sections for WÆWÆ and WZ in a fiducial region
Summary
Backgrounds from opposite-sign lepton pairs misreconstructed as same-sign (“wrong-sign background”), WW production via double parton scattering (DPS), and triboson production (VVV), which includes top-pair plus boson processes, contribute less than 10%
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