https://doi.org/10.1140/epjc/s10052-015-3345-5
Regular Article - Theoretical Physics
Pseudo-observables in Higgs decays
1
IPN de Lyon/CNRS, Université Lyon 1, Villeurbanne, France
2
Physik-Institut, Universität Zürich, 8057, Zurich, Switzerland
3
INFN, Laboratori Nazionali di Frascati, 00044, Frascati, Italy
* e-mail: gino.isidori@lnf.infn.it
Received:
3
January
2015
Accepted:
2
March
2015
Published online:
20
March
2015
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 “
-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 
decays for the extraction of such parameters and present their predictions in the linear EFT framework.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
