Going beyond "kappa-framework": Higgs Pseudo-observables
I revisit a set of pseudo-observables (PO) in Higgs decays that parameterise, in great generality, possible beyond the Standard Model effects. PO are defined from the decomposition of onshell decay amplitudes around the physical poles. On the one hand, PO can be determined from experimental data, providing a systematic generalisation of the ”κ-framework” so far adopted by the LHC experiments. On the other hand, PO can be computed in large set of new physics (NP) models and, in particular, in any Effective Field Theory (EFT) approach to Higgs physics. The PO framework allows for a systematic inclusion of higher-order QED/QCD corrections. These features single out PO as a correct formalism for general interpretation of the upcoming precision measurements in Higgs physics.