Speaker
Vyacheslav Rychkov
(Scuola Normale Superiore)
Description
As a way to extend the naturalness domain of the Standard Model,
we enlarge the symmetry of the top-Higgs sector to a softly broken SO(5).
Depending on its parameters, the model can either be viewed as describing
a perturbatively coupled Higgs boson or as the low energy description of
a strongly coupled theory at the naturalness cutoff.
We perform the ElectroWeak Precision Test (EWPT) analysis,
taking into account the important contribution of new fermionic states to the T
parameter.
To estimate the contribution to the S parameter from the cutoff, and to
appreciate the dual role of the model, we also consider the properties of its
"holographic" and "deconstructed holographic" extensions. It is unlikely that
these attempts at UV completion fare significantly better than the minimal setup
with respect to the EWPT and naturalness.
Authors
Riccardo Barbieri
(Scuola Normale Superiore)
Vyacheslav Rychkov
(Scuola Normale Superiore)
Co-authors
Alvise Varagnolo
(Scuola Normale Superiore)
Brando Bellazzini
(Scuola Normale Superiore)