Higgs pseudo-observables

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• David Marzocca (Zurich)
• Friday 15 May 2015, 16:00-17:00
• Seminar Room B, Rutherford Building, Cavendish Laboratory.

If you have a question about this talk, please contact Damien George.

We introduce a set of pseudo-observables (PO), defined from the on-shell amplitudes, characterising the properties of Higgs decays in generic extensions of the Standard Model with no new particles below the Higgs mass. These provide a systematic generalisation of the kappa framework used by the LHC experiments. The PO allow for a systematic inclusion of radiative corrections. Symmetries of the new-physics sector, such as CP invariance, lepton-universality, and custodial symmetry, imply relations among the PO, which could be tested directly from Higgs data. The Higgs PO can be matched to any effective theory, in particular assuming the linear EFT allows to derive strong predictions —due to LEP bounds— which can be tested by Higgs data.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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