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Pseudo-observables in Higgs decays
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Pseudo-observables in Higgs decays
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We define a set of pseudo-observables characterizing the properties of Higgs decays in generic extensions of the Standard Model with no new particles below the Higgs mass. The pseudo-observables can be determined from experimental data, providing a systematic generalization of the "kappa-framework" so far adopted by the LHC experiments. The pseudo-observables are defined from on-shell decay amplitudes, allow for a systematic inclusion of higher-order QED and QCD corrections, and can be computed in any Effective Field Theory (EFT) approach to Higgs physics. We analyze the reduction of the number of independent pseudo-observables following from the hypotheses of lepton-universality, CP invariance, custodial symmetry, and linearly realized electroweak symmetry breaking. We outline the importance of kinematical studies of $h\to 4\ell$ decays for the extraction of such parameters and present their predictions in the linear EFT framework.
Forward citations
Cited by 3 Pith papers
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Proposal for the validation of Monte Carlo implementations of the standard model effective field theory
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Angular and invariant-mass observables in the four-body Higgs decay $h\to\ell\bar{\nu}_\ell\bar{\ell}^\prime\nu_{\ell^\prime}$
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Constraints on the Higgs-gluon effective coupling through $h \to \gamma\gamma$ decays at the LHC
Monte Carlo simulations of the diphoton Higgs channel in an effective coupling model reproduce the official ATLAS and CMS constraints on the gluon coupling modifier kappa_g.
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