Low-mass Higgs decays to four leptons at one loop and beyond

Abstract

The ongoing searches for Higgs-boson signals in data taken at the CERN LHC and the Fermilab Tevatron crucially rely on the decay channels H -> Z l l and H -> W l nu. We present a precision study of the partial widths of these decay channels including the full one-loop electroweak corrections and the dominant contributions at two and three loops, of O(G_F^2 m_t^4), O(G_F m_t^2 alpha_s), and O(G_F m_t^2 alpha_s^2). Since the invariant mass of the off-shell intermediate boson is relatively low in the mass window 115 GeV < m_H < 129 GeV of current interest, lepton mass effects are relevant, especially for the tau lepton.

18 pages, 4 figures, numerical analysis updated using 2012 PDG input, references added, accepted for publication in Phys. Rev. D

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Cited by in corpus (14)

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• Directly Measuring the Tensor Structure of the Scalar Coupling to Gauge Bosons
• Beyond Geolocating: Constraining Higher Dimensional Operators in $H\to 4\ell$ with Off-Shell Production and More
• On the difference between the pole and the MSbar masses of the top quark at the electroweak scale
• Precision studies of the Higgs boson decay channel H -> ZZ -> 4l with MEKD
• Nonstandard Higgs Couplings from Angular Distributions in $h\to Z{\ell }^{+}{\ell }^{-}$
• Mixed QCD-EW corrections for Higgs boson production at $e^{+}{e}^{-}$ colliders
• Geolocating the Higgs Boson Candidate at the LHC
• The role of interference in unraveling the ZZ-couplings of the newly discovered boson at the LHC
• Expected Precision of Higgs Boson Partial Widths within the Standard Model
• Lepton-mass effects in the decays $H\to Z{Z}^{\ast }\to {\ell }^{+}{\ell }^{-}{\tau }^{+}{\tau }^{-}$ and $H\to W{W}^{\ast }\to \ell \nu \tau {\nu }_{\tau }$
• Mixed QCD-EW corrections for Higgs leptonic decay via $H{W}^{+}{W}^{-}$ vertex
• Two-loop triangle integrals with 4 scales for the $HZV$ vertex
• One-loop formulas for $H\to Z{\nu }_l{\bar{\nu }}_l$ for $l=e,\mu ,\tau$ in 't Hooft-Veltman gauge