Abstract
We have calculated the next-to-leading-order electroweak and QCD corrections to the decay processes h → WW/ZZ → 4 fermions of the light CP-even Higgs boson h of various types of Two-Higgs-Doublet Models (Types I and II, “lepton-specific” and “flipped” models). The input parameters are defined in four different renormalization schemes, where parameters that are not directly accessible by experiments are defined in the overline{mathrm{MS}} scheme. Numerical results are presented for the corrections to partial decay widths for various benchmark scenarios previously motivated in the literature, where we investigate the dependence on the overline{mathrm{MS}} renormalization scale and on the choice of the renormalization scheme in detail. We find that it is crucial to be precise with these issues in parameter analyses, since parameter conversions between different schemes can involve sizeable or large corrections, especially in scenarios that are close to experimental exclusion limits or theoretical bounds. It even turns out that some renormalization schemes are not applicable in specific regions of parameter space. Our investigation of differential distributions shows that corrections beyond the Standard Model are mostly constant offsets induced by the mixing between the light and heavy CP-even Higgs bosons, so that differential analyses of h→4f decay observables do not help to identify Two-Higgs-Doublet Models. Moreover, the decay widths do not significantly depend on the specific type of those models. The calculations are implemented in the public Monte Carlo generator Prophecy4f and ready for application.
Highlights
The CERN Large Hadron Collider (LHC) was built to explore the validity of the Standard Model (SM) of particle physics at energy scales ranging from the electroweak scale ∼100 GeV up to energies of some TeV and to search for new phenomena and new particles in this energy domain
The negative deviation from the SM rises to almost 2%, no final state accounts for distinctively large Two-Higgs-Doublet Models (THDMs) effects that could be exploited in experiments
We have investigated the decay processes h → WW/ZZ → 4f in the THDM, where we identify the light neutral CP-even Higgs boson h with the discovered Higgs boson of mass Mh = 125 GeV
Summary
The CERN Large Hadron Collider (LHC) was built to explore the validity of the Standard Model (SM) of particle physics at energy scales ranging from the electroweak scale ∼100 GeV up to energies of some TeV and to search for new phenomena and new particles in this energy domain. The fermions in the final state of these processes can either be quarks or leptons, and especially the latter can be resolved very well in the detector These four-body decays were already crucial in the Higgs-boson discovery, and play a major role in precision studies of the Higgs boson, in particular, to determine the couplings to the EW gauge bosons W and Z. The Monte Carlo program Prophecy4f [34,35,36] performs the calculation of the full NLO EW and QCD corrections for all h → WW/ZZ → 4f channels in the complex-mass scheme [37,38,39] to describe the intermediate W- and Z-boson resonances It provides differential distributions as well as unweighted events for leptonic final states. Final states neutral current neutral current with interference charged current charged and neutral current leptonic νeνeνμνμ (3) e−e+μ−μ+ (3) νeνeμ−μ+ (6)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
