Abstract
The discovery of the Higgs boson, with a mass known to be better than the percent level, enables precision Higgs boson analyses for the first time. Toward this goal, we define an expansion formalism of the Higgs boson partial widths and branching fractions that facilitates such studies. This expansion yields the observables as a perturbative expansion around reference values of Standard Model input observables (quark masses, QCD coupling constant, etc.). We compute the coefficients of the expansion using state-of-the-art results. We also study the various sources of uncertainties in computing the partial widths and branching fractions more precisely. We discuss the impact of these results with efforts to discern new physics through precision Higgs boson studies.
Highlights
With the discovery of the Higgs boson [1], particle physics is entering a new era of precision studies of the Higgs sector
We study the various sources of uncertainties in computing the partial widths and branching fractions more precisely
The higher-order contributions to ΓðH → γγÞ are known to Next-to-next-to-leading order (NNLO) Oðα2SÞ in QCD [13], and at Next-to-leading order (NLO) in purely electroweak (EW) corrections [14]
Summary
With the discovery of the Higgs boson [1], particle physics is entering a new era of precision studies of the Higgs sector. The observables are many and include the Higgs boson mass, its total decay width, its spin, its decay branching fractions to Standard Model (SM) particles, its possible decay branching fractions to other exotic final states, and its various production rates at colliders. All of these observables will be studied carefully in time. Other calculations exist in the literature, most notably from the computer program HDECAY [2]; we wish to provide an independent calculation that includes the latest advances and allows us to vary the renormalization scale in all parts of the computations This flexibility will be useful in later discussions regarding uncertainties. We discuss some implications for physics beyond the SM sensitivities in precision Higgs studies
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