Abstract

A search for anomalous electroweak production of WW, WZ, and ZZ boson pairs in association with two jets in proton-proton collisions at s=13TeV at the LHC is reported. The data sample corresponds to an integrated luminosity of 35.9fb−1 collected with the CMS detector. Events are selected by requiring two jets with large rapidity separation and invariant mass, one or two leptons (electrons or muons), and a W or Z boson decaying hadronically. No excess of events with respect to the standard model background predictions is observed and constraints on the structure of quartic vector boson interactions in the framework of dimension-8 effective field theory operators are reported. Stringent limits on parameters of the effective field theory operators are obtained. The observed 95% confidence level limits for the S0, M0, and T0 operators are −2.7<fS0/Λ4<2.7, −1.0<fM0/Λ4<1.0, and −0.17<fT0/Λ4<0.16, in units of TeV−4. Constraints are also reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass from 600 to 2000 GeV. The results are interpreted in the context of the Georgi–Machacek model.

Highlights

  • Measurements of vector boson scattering (VBS) processes probe the non-Abelian gauge structure of the electroweak (EW) interactions of the standard model (SM) of particle physics

  • At the CERN LHC interactions from VBS are characterized by the presence of two gauge bosons in association with two forward jets with large rapidity separation and large dijet invariant mass

  • The S0 and S1 operators are constructed from the covariant derivative of the Higgs doublet

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Summary

Introduction

Measurements of vector boson scattering (VBS) processes probe the non-Abelian gauge structure of the electroweak (EW) interactions of the standard model (SM) of particle physics. Models of physics beyond the SM predict enhancements in VBS processes through modifications of the Higgs boson couplings to gauge bosons [4,5]. The estimation of the shape and yield of the major background W(Z)+jets in the WV (ZV) channel is based on the observed data using the sideband of the signal region defined by the mass of the V jet. The background processes are modeled by fitting the mWV and mZV distributions in the respective sideband regions with the parametric function f (m) = exp [−m/(c0 + c1m)]. The contribution of the SM EW VV process is expected to be small in the sideband region, even with enhancements of the cross section due to aQGCs, with a predicted yield of approximately 1% of the selected events

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