Study of the 125 GeV Standard Model Higgs Boson Partial Widths and Branching Fractions

Abstract

The discovery of the Higgs boson, with mass known to better than the percent level, enables for the first time precision Higgs boson analyses. 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.

23 pages, 2 figures; v3: addendum with MSbar mass inputs and lower uncertainties

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• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Higgs Decay to Gluons at NNLO
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• Non-perturbative quark mass renormalisation and running in $N_f=3$ QCD
• Precision Electroweak Analysis after the Higgs Boson Discovery
• The Dimension Six Triple Gluon Operator in Higgs+Jet Observables
• Expected Precision of Higgs Boson Partial Widths within the Standard Model
• $h^0\to c\bar{c}$ as a test case for quark flavor violation in the MSSM
• The role of low-energy observables in precision Higgs analysis
• Higgs boson mass and high-luminosity LHC probes of supersymmetry with vectorlike top quark
• Higgs couplings and electroweak observables: a comparison of precision tests
• Indirect reach of heavy MSSM Higgs bosons by precision measurements at future lepton colliders
• Establishing the Isolated Standard Model
• Correlation between the decays $h^0\to \gamma \gamma /gg$ in the MSSM with quark flavour violation
• Resolving charm and bottom quark masses in precision Higgs boson analyses
• Impact of quark flavor violating SUSY on h(125) decays at future lepton colliders