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Standard Model Higgs-Boson Branching Ratios with Uncertainties

A. Denner, S. Heinemeyer, I. Puljak, D. Rebuzzi, M. Spira

TL;DR

This paper provides updated Standard Model predictions for the Higgs boson decay widths and branching ratios, including a comprehensive assessment of parametric and theoretical uncertainties. The analysis employs HDECAY and Prophecy4f to compute partial widths and four-fermion final states, with a detailed uncertainty propagation that preserves unitarity of branching ratios. By using refined input parameters (notably 1-loop pole masses) and explicit error sources, the authors reduce uncertainties in key channels and offer a robust framework for interpreting LHC/Tevatron Higgs searches. The work also compares its uncertainty estimates with prior studies, highlighting improvements that aid precision Higgs coupling extractions and mass determinations.

Abstract

We present an update of the branching ratios for Higgs-boson decays in the Standard Model. We list results for all relevant branching ratios together with corresponding uncertainties resulting from input parameters and missing higher-order corrections. As sources of parametric uncertainties we include the masses of the charm, bottom, and top quarks as well as the QCD coupling constant. We compare our results with other predictions in the literature.

Standard Model Higgs-Boson Branching Ratios with Uncertainties

TL;DR

This paper provides updated Standard Model predictions for the Higgs boson decay widths and branching ratios, including a comprehensive assessment of parametric and theoretical uncertainties. The analysis employs HDECAY and Prophecy4f to compute partial widths and four-fermion final states, with a detailed uncertainty propagation that preserves unitarity of branching ratios. By using refined input parameters (notably 1-loop pole masses) and explicit error sources, the authors reduce uncertainties in key channels and offer a robust framework for interpreting LHC/Tevatron Higgs searches. The work also compares its uncertainty estimates with prior studies, highlighting improvements that aid precision Higgs coupling extractions and mass determinations.

Abstract

We present an update of the branching ratios for Higgs-boson decays in the Standard Model. We list results for all relevant branching ratios together with corresponding uncertainties resulting from input parameters and missing higher-order corrections. As sources of parametric uncertainties we include the masses of the charm, bottom, and top quarks as well as the QCD coupling constant. We compare our results with other predictions in the literature.

Paper Structure

This paper contains 10 sections, 6 equations, 4 figures, 25 tables.

Table of Contents

  1. Introduction
  2. Programs and Strategy for Branching Ratio Calculations
  3. The SM Input-Parameter Set
  4. Procedure for determining Uncertainties
  5. Parametric uncertainties
  6. Theoretical uncertainties
  7. Results
  8. Comparison with Previous Calculations
  9. Summary and Conclusion
  10. Acknowledgments

Figures (4)

  • Figure 1: Higgs branching ratios and their uncertainties for the low mass range.
  • Figure 2: Higgs branching ratios and their uncertainties for the full mass range.
  • Figure 3: Higgs branching ratios for the different $\mathrm{H} \to 4\mathrm{l}$ and $\mathrm{H} \to 2\mathrm{l}2\nu$ final states and their uncertainties for the full mass range.
  • Figure 4: Higgs branching ratios for $\mathrm{H} \to 4\mathrm{q}$, $\mathrm{H} \to 4\mathrm{f}$ and $\mathrm{H} \to 2\mathrm{q}2\mathrm{l}, 2\mathrm{q} \mathrm{l} \nu, 2\mathrm{q} 2 \nu$ final states and their uncertainties for the full mass range.