Abstract
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 signalling the appearance of a resonance (or resonances) nearby that scale. In this article, we investigate in detail SM EFT effects from dimension-6 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 $SU(2)$ field strength tensors responsible for strong transversely polarized vector boson interactions. Current global fits on Wilson-coefficients allow for a signal immediately permissive at the HL-LHC if not accessible at the current LHC-dataset.
Highlights
The assumption that the Standard Model is an effective field theory (SM energy field theory (EFT)) of a more fundamental theory at a higher energy scale implies a growth of cross sections for electroweak vector-boson scattering (VBS) processes signaling the appearance of a resonance near that scale
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)
It is widely believed that the Standard Model (SM) [1,2,3] is an effective, low-energy field theory (EFT) approximation [4,5,6] to a more fundamental theory (UV theory) which overtakes the SM at energies higher than the electroweak (EW) scale
Summary
It is widely believed that the Standard Model (SM) [1,2,3] is an effective, low-energy field theory (EFT) approximation [4,5,6] to a more fundamental theory (UV theory) which overtakes the SM at energies (at least several times) higher than the electroweak (EW) scale. In the case of transverse gauge boson scattering, we consider the effect of dimension-eight operators It is well known [46,47] that dimension-eight operators may dominate (up to cancellations between coefficients induced by the UV theory) the VBS cross sections at energies. Constitutes a realistic assumption, e.g., (a) in the case of certain universal models with only bosonic weakly coupled BSM sector [52,53] (given the current experimental constraints on EFT coefficients), and (b) scenarios in which transversal modes of vector bosons have composite origin [46,53]. We discuss the effects of background EFT operators
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