Radiative corrections to the semileptonic and hadronic Higgs-boson decays H→WW/ZZ→4 fermions

By A. Bredenstein, Ansgar Denner, Stefan Dittmaier, M. M. Weber. 2006

290 citations recorded by the source corpus.

The radiative corrections of the strong and electroweak interactions are calculated for the Higgs-boson decays H→WW/ZZ→4f with semileptonic or hadronic four-fermion final states in next-to-leading order. This calculation is improved by higher-order corrections originating from heavy-Higgs-boson effects and photonic final-state radiation off charged leptons. The W- and Z-boson resonances are treated within the complex-mass scheme, i.e. without any resonance expansion or on-shell approximation. The calculation essentially follows our previous study of purely leptonic final states. The electroweak corrections are similar for all four-fermion final states; for integrated quantities they amount to some per cent and increase with growing Higgs-boson mass MH, reaching 7–8% at MH ~ 500 GeV. For distributions, the corrections are somewhat larger and, in general, distort the shapes. Among the QCD corrections, which include corrections to interference contributions of the Born diagrams, only the corrections to the squared Born diagrams turn out to be relevant. These contributions can be attributed to the gauge-boson decays, i.e. they approximately amount to αs/π for semileptonic final states and 2αs/π for hadronic final states. The discussed corrections have been implemented in the Monte Carlo event generator PROPHECY4F.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e89da25bfae6558afdf78b0f6a193bf8865a9426

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In Nuclear and High Energy Physics

Citations in the corpus

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC (2012, unknown): “The branching ratios of the SM Higgs boson as a function of m H , as well as their uncertainties, are calculated using the HDECAY [54] and PROPHECY4F [55, 56] programs and are taken from Refs.”
Measurements of the properties of the Higgs-like boson in the four lepton decay channel with the ATLAS detector using 25 fb$^{-1}$ of proton-proton collision data (2013, methodology): “The Higgs boson decay branching ratios [44] to the different four-lepton final states are provided by P4 [45, 46], which includes the complete NLO QCD+EW corrections and interference effects between identical final-state fermions.”
Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector (2017, methodology): “Branching fractions for all other scenarios use a combination of results calculated by HDecay, FeynHiggs and PROPHECY4f [87, 88].”
Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC (2013, unknown): “ggF, VBF POWHEG [33, 34]+PYTHIA WH, ZH, tt̄H PYTHIA H→ZZ∗→ 4` decay PROPHECY4f [35, 36] W+jets, Z/γ∗+jets ALPGEN [37]+HERWIG [38],”
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, methodology): “The complex-mass scheme, first used for four-fermion production in e+e− physics [192], 24 is frequently used in NLO calculations for weak gauge-boson or Higgs-boson processes at the LHC, for example for the off-shell Higgs-boson decays H →WW/ZZ → 4 fermions at NLO accuracy in the Monte Carlo program”