Abstract
We present the HiggsPO UFO model for Monte Carlo event generation of electroweak VH and VBF Higgs production processes at NLO in QCD in the formalism of Higgs pseudo-observables (PO). We illustrate the use of this tool by studying the QCD corrections, matched to a parton shower, for several benchmark points in the Higgs PO parameter space. We find that, while being sizable and thus important to be considered in realistic experimental analyses, the QCD higher-order corrections largely factorize. As an additional finding, based on the NLO results, we advocate to consider 2D distributions of the two-jet azimuthal-angle difference and the leading jet p_T for new physics searches in VBF Higgs production. The HiggsPO UFO model is publicly available.
Highlights
The framework of Higgs pseudo-observables (PO) allows to describe in great generality Higgs production [1] and decay [2] processes in terms of few parameters defined from the properties of the relevant on-shell physical amplitude.1 In particular, h → 4 f decays and electroweak Higgs production processes, associated pp → Z h and pp → W h production (V H ) as well as vector boson fusion (VBF) production pp → h j j, can be completely characterized by a set of onshell correlation functions 0|T{ J μf (x), J ν f (y), h(0)}|0, where μ f, f are the corresponding fermionic currents for each process
We present the HiggsPO UFO model for Monte Carlo event generation of electroweak V H and VBF Higgs production processes at next-to-leading order (NLO) in QCD in the formalism of Higgs pseudo-observables (PO)
In this paper we present the upgrade able to generate electroweak Higgs production events at next-to-leading order (NLO) accuracy in QCD matched to parton showers [29]
Summary
The framework of Higgs pseudo-observables (PO) allows to describe in great generality Higgs production [1] and decay [2] processes in terms of few parameters defined from the properties of the relevant on-shell physical amplitude. In particular, h → 4 f decays and electroweak Higgs production processes, associated pp → Z h and pp → W h production (V H ) as well as vector boson fusion (VBF) production pp → h j j, can be completely characterized by a set of onshell correlation functions 0|T{ J μf (x), J ν f (y), h(0)}|0, where μ f, f are the corresponding fermionic currents for each process. The final goal is the possibility to simulate the electroweak Higgs production processes in a realistic environment, for arbitrary values of the Higgs PO, and with a theoretical precision exceeding the experimental one. Such an implementation was initiated in [1] with the realisation of the universal FeynRules (UFO) model, called HiggsPO, which can be used for example within the MadGraph5_aMC@NLO [27] or Sherpa [28] event generators at leading order (LO) in QCD. In this paper we present the upgrade able to generate electroweak Higgs production events at next-to-leading order (NLO) accuracy in QCD matched to parton showers [29]. The HiggsPO NLO UFO model is publicly available at http://www.physik.uzh.ch/data/HiggsPO
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