Standard model EFT effects in vector-boson scattering at the LHC

The assumption that the Standard Model is an effective field theory (SM EFT) of a more fundamental theory at a higher (than electroweak) energy scale implies a growth of cross sections for electroweak vector-boson scattering (VBS) processes signaling the appearance of a resonance (or resonances) near that scale. In this article, we investigate in detail SM EFT effects from dimension-six operators in VBS with like-sign-W production in fully leptonic decay modes at the high-luminosity LHC (HL-LHC). We find that these effects are important for a handful of operators, most notably for the operator composed of three S U (2 ) field-strength tensors responsible for strong transversely polarized vector-boson interactions. Current global fits on Wilson coefficients allow for an observable signal at the HL-LHC, if not accessible with the current LHC data set.