Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 75, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-015-3345-5
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Funding
- Lyon Institute of Origins [ANR-10-LABX-66]
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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 -> 4l decays for the extraction of such parameters and present their predictions in the linear EFT framework.
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