Abstract
A measurement of the production cross section for two same-sign W± bosons in association with dijets was performed using 20.3 fb-1 of proton-proton collision data collected at s=8 GeV with the ATLAS detector. The background-only hypothesis was rejected at the 4.5σ confidence level and the measured fiducial cross section is in agreement with the Standard Model prediction. Evidence for the electroweak component of this process was observed at the 3.6σ level and a measurement of the fiducial cross section for the electroweak production of the W±W±jj final state was reported. The electroweak component contains contributions from vector boson scattering diagrams. Thus, the fiducial cross section measurement was used to derive constraints on exotic contributions to the quartic WWWW gauge boson vertex. In these proceedings, a brief description of the analysis is presented.
Highlights
PerThe background-only hypothesis was rejected at the 4.5σ confidence level and the measured fiducial cross section is in agreement with the Standard Model prediction
Evidence for the electroweak component of this process was observed at the 3.6σ level and a measurement of the fiducial cross section for the electroweak production of the W±W± j j final state was reported
Scattering processes of two heavy vector bosons (VBS) are a crucial probe to study the nature of electroweak symmetry breaking
Summary
Scattering processes of two heavy vector bosons (VBS) are a crucial probe to study the nature of electroweak symmetry breaking. Investigating the scattering of same-sign W± bosons is motivated by the absence of gg initiated QCD processes for this final state, that significantly improves the cross section ratio σEfidWK/σQfidCD in a VBS enhanced phase space. This unique feature greatly facilitates the extraction of the EWK component of the pp → ±ν ±ν j j process (hereinafter referred to as W±W± j j). As none of the two categories had been observed before, this analysis focused on a measurement of the inclusive production cross section of the process W±W± j j in a fiducial phase space Another more restricted phase space was used to extract the fiducial cross section of the EWK component and to constrain possible exotic contributions to the WWWW vertex.
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