%0 Journal Article
%T Pseudo-observables in Higgs decays
%A Martin Gonzalez-Alonso
%A Admir Greljo
%A Gino Isidori
%A David Marzocca
%J Physics
%D 2014
%I arXiv
%R 10.1140/epjc/s10052-015-3345-5
%X 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.
%U http://arxiv.org/abs/1412.6038v2