Abstract
Weak vector boson scattering (VBS) at the LHC provides an excellent source of information on the structure of quartic gauge couplings and possible effects of physics beyond the SM in electroweak symmetry breaking. Parameterizing deviations from the SM within an effective field theory at tree level, the dimension-8 operators, which are needed for sufficiently general modeling, lead to unphysical enhancements of cross sections within the accessible energy range of the LHC. Preservation of unitarity limits is needed for phenomenological studies of the VVjj events which signify VBS. Here we develop a numerical unitarization scheme for the full off-shell VBS processes and apply it to same-sign W scattering, i.e. processes like qqrightarrow qqW^+W^+. The scheme is implemented within the Monte Carlo program VBFNLO, including leptonic decay of the weak bosons and NLO QCD corrections. Distributions differentiating between higher dimensional operators are discussed.
Highlights
We introduce a variant of the T/K-matrix unitarization scheme [12,14], called the longitudinal operator OS1 (Tu) unitarization below, for general combinations of operators within vector boson scattering (VBS), for arbitrary space-like virtualities of the incoming vector bosons, and describe its implementation in the Monte Carlo generator VBFNLO [15,16,17]
Because of the large energy reach of hadron colliders, which spans from low energies and momentum transfers where the pure
effective field theory (EFT) description is valid, to regions of phase space where the polynomial growth of partial wave amplitudes with energy exceeds unitarity limits, the naive EFT description must be generalized to a model which respects unitarity bounds
Summary
We introduce a variant of the T/K-matrix unitarization scheme [12,14], called Tu unitarization below, for general combinations of operators within VBS, for arbitrary space-like virtualities of the incoming vector bosons, and describe its implementation in the Monte Carlo generator VBFNLO [15,16,17].
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