Abstract
We discuss the Standard Model — Effective Field Theory (SM-EFT) contributions to neutral- and charge-current Drell-Yan production, associated production of the Higgs and a vector boson, and Higgs boson production via vector boson fusion. We consider all the dimension-six SM-EFT operators that contribute to these processes at leading order, include next-to-leading order QCD corrections, and interface them with parton showering and hadronization in Pythia8 according to the POWHEG method. We discuss existing constraints on the coefficients of dimension-six operators and identify differential and angular distributions that can differentiate between different effective operators, pointing to specific features of Beyond-the-Standard-Model physics.
Highlights
The higher-dimensional operators start at dimension-five, where there is a single gauge-invariant operator that violates lepton number and is responsible for the neutrino masses and mixings [17]
We consider all the dimension-six Standard Model — Effective Field Theory (SM-EFT) operators that contribute to these processes at leading order, include next-to-leading order QCD corrections, and interface them with parton showering and hadronization in Pythia8 according to the POWHEG method
In this paper we study the complete set of dimension-six operators, in the basis of ref. [13], that gives tree-level contributions to the neutral-current (NC) and charged-current (CC) Drell-Yan processes, to the associated production of the Higgs and a W or Z boson (W H and ZH production), and to Higgs boson production via vector boson fusion (VBF)
Summary
Before discussing dimension-six operators, we recall a few SM ingredients needed to establish our conventions. The remaining operators in the class LX2φ2 involve the gluon field strength Gμν While these are very interesting for Higgs boson production via gluon fusion, they contribute to the processes we are considering — all of which are (anti-)quark-initiated — only at higher order, and we neglect them. The classes ψ2Xφ and ψ2φ2D both contain fermion bilinears The former class consists of dipole operators, of which we focus on the dipole couplings of quarks and leptons to the SU(2)L and U(1)Y gauge bosons: Lψ2 X φ. The operators c(L1φ), c(L3φ), ceφ couple lepton bilinears to the weak bosons, affecting Z and W production at tree level. These operators are strongly constrained by LEP measurements of the physics.
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