Higgs pseudo-observables: production and decay beyond the kappa framework

Tuesday, 13 October 2015 at 11:15 in Y36 J33

We introduce a set of pseudo-observables (PO), defined from the on-shell amplitudes, characterizing the properties of on-shell Higgs production and decay in generic extensions of the Standard Model with no new particles below the Higgs mass. These PO provide a systematic generalization of the kappa framework used by the LHC experiments, allowing for a systematic inclusion of radiative corrections. Symmetries of the new-physics sector, such as CP invariance, flavor-universality, and custodial symmetry, imply relations among the PO, which could be tested directly from Higgs data. Matching the Higgs PO to the linear EFT allows to combine LHC and LEP results, providing strong predictions which can be tested by Higgs data.