Abstract
We study the impact of dimension-six operators of the standard model effective field theory relevant for vector-boson fusion and associated Higgs boson production at the LHC. We present predictions at the next-to-leading order accuracy in QCD that include matching to parton showers and that rely on fully automated simulations. We show the importance of the subsequent reduction of the theoretical uncertainties in improving the possible discrimination between effective field theory and standard model results, and we demonstrate that the range of the Wilson coefficient values allowed by a global fit to LEP and LHC Run I data can be further constrained by LHC Run II future results.
Highlights
The formulation of the effective Lagrangian restricted to operators of dimension of at most six relies on the definition of a complete and non-redundant operator basis [1,2,3] and should include the translations among the possible choices [4]
We have presented FeynRules and Universal FeynRules Output (UFO) implementations of dimension-six SMEFT operators affecting electroweak Higgs-boson production, which can be used for NLO(QCD)+PS accurate Monte Carlo event generation within the MG5_aMC framework
We have showcased the strength of our approach by simulating both associated VH and vector-boson fusion (VBF) Higgs-boson production at the 13 TeV LHC, selecting a pair of benchmark scenarios informed both by recent limits from global fits to the LEP and LHC Run I data and by theoretical motivations originating from integrating out certain popular ultraviolet realisations
Summary
The formulation of the effective Lagrangian restricted to operators of dimension of at most six relies on the definition of a complete and non-redundant operator basis [1,2,3] and should include the translations among the possible choices [4]. What we present in this paper is a part of the current theoretical activities aiming for precision predictions for electroweak Higgs-boson production at the LHC, i.e. Higgs boson production in association with a weak boson (VH) and via vector-boson fusion (VBF) In this context, NLO+PS (next-to-leading order plus parton-shower) matched predictions for VH and VBF production in the SM have been released both in the MC@NLO [6,7,8] and Powheg [9,10,11] frameworks and merged NLO samples describing VH production including up to one additional jet have been generated in both the Powheg [12] and Sherpa [13] platforms. Practical information for event simulation and model validations are provided in the appendix
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