Bayesian Model comparison of Higgs couplings

Abstract

We investigate the possibility of contributions from physics beyond the Standard Model (SM) to the Higgs couplings, in the light of the LHC data. The work is performed within an interim framework where the magnitude of the Higgs production and decay rates are rescaled though Higgs coupling scale factors. We perform Bayesian parameter inference on these scale factors, concluding that there is good compatibility with the SM. Furthermore, we carry out Bayesian model comparison on all models where any combination of scale factors can differ from their SM values and find that typically models with fewer free couplings are strongly favoured. We consider the evidence that each coupling individually equals the SM value, making the minimal assumptions on the other couplings. Finally, we make a comparison of the SM against a single "not-SM" model, and find that there is moderate to strong evidence for the SM.

24 pages, 4 figures

References in corpus (17)

• 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
• Bayes in the sky: Bayesian inference and model selection in cosmology
• The global electroweak fit at NNLO and prospects for the LHC and ILC
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states
• Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC
• Precision Measurements of Higgs Couplings: Implications for New Physics Scales
• Probing wrong-sign Yukawa couplings at the LHC and a future linear collider
• LHC HXSWG interim recommendations to explore the coupling structure of a Higgs-like particle
• Minimal Composite Higgs Models at the LHC
• Search for the Standard Model Higgs boson decay to ${\mu }^{+}{\mu }^{-}$ with the ATLAS detector
• Higgcision Updates 2014
• Higgs couplings: disentangling New Physics with off-shell measurements
• A Bayesian comparison of U(1) lepton flavour models
• Bayesian Model Averaging in Astrophysics: A Review

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• Discriminating between Higgs Production Mechanisms via Jet Charge at the LHC
• Higgs Effective Field Theories - Systematics and Applications