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Higgs-Boson Decays: Updates

Emanuele Bagnaschi, Lisa Biermann, Michael Spira

TL;DR

This article surveys updated SM Higgs decay predictions, emphasizing $H\to gg$, Yukawa-induced $H\to s\bar{s}$, and Higgs Dalitz decays, with a focus on finite-quark-mass effects and higher-order corrections. It reports extensions to the Hdecay framework, including mass grids up to $M_H=3$ TeV and new predictions for strange-quark final states, alongside a detailed treatment of strong/weak Dalitz channels. The results quantify perturbative uncertainties (a few percent for $H\to gg$ and per-mille to percent for Dalitz decays) and discuss how invariant-mass cuts in $H\to s\bar{s}$ final states can aid strange-Yukawa extraction at future colliders. These updates sharpen precision Higgs-physics tests and inform strategies to probe light-quark Yukawa couplings. The work also clarifies the interplay between $H\to Z\gamma$ and non-resonant Dalitz decays in the context of ongoing and future analyses.

Abstract

In this contribution, new developments for the Standard Model Higgs-boson decays will be summarized.

Higgs-Boson Decays: Updates

TL;DR

This article surveys updated SM Higgs decay predictions, emphasizing , Yukawa-induced , and Higgs Dalitz decays, with a focus on finite-quark-mass effects and higher-order corrections. It reports extensions to the Hdecay framework, including mass grids up to TeV and new predictions for strange-quark final states, alongside a detailed treatment of strong/weak Dalitz channels. The results quantify perturbative uncertainties (a few percent for and per-mille to percent for Dalitz decays) and discuss how invariant-mass cuts in final states can aid strange-Yukawa extraction at future colliders. These updates sharpen precision Higgs-physics tests and inform strategies to probe light-quark Yukawa couplings. The work also clarifies the interplay between and non-resonant Dalitz decays in the context of ongoing and future analyses.

Abstract

In this contribution, new developments for the Standard Model Higgs-boson decays will be summarized.

Paper Structure

This paper contains 6 sections, 3 equations, 3 figures, 1 table.

Table of Contents

  1. Introduction
  2. $H\to gg$
  3. $H\to f\bar{f}$
  4. $H\to Z\gamma$ and Dalitz decays
  5. Dalitz decays into strange quarks
  6. Conclusions

Figures (3)

  • Figure 1: Relative NLO QCD corrections with and without finite top mass effects. The dashed line shows the NLO QCD corrections in the heavy-top limit (HTL), while the full line includes the full quark-mass effects at NLO QCD. The corrections are related to the notation of Eq. (\ref{['eq:h2ggqcd']}) by $\delta = E~\alpha_s/\pi$, where $\Delta E$ is put to zero in the HTL.
  • Figure 2: Typical diagrams contributing to (a) $H\to s\bar{s}$, (b) $H\to s\bar{s} g$ and (c) $H\to s\bar{s}\gamma$.
  • Figure 3: The differential partial width of (a) the strong Dalitz decay $H\to s\bar{s} g$ and (b) the weak Dalitz decay $H\to s\bar{s}\gamma$ as a function of the invariant $s\bar{s}$ mass $Q$ normalized to the inclusive partial decay width $\Gamma_{ss} = \Gamma(H\to s\bar{s})$. The kinematical strange-mass has been set to zero. No resummation of soft gluon and photon effects has been performed at the upper end of the spectra, while finite strange-mass effects will be relevant only in the low-$Q$ region.