Orateur
Prof.
Vincenzo Branchina
(University of Catania)
Description
According to the usual analysis, the presence of new physics
at very high energy scales (Planck scale) has no impact on
the stability condition of the EW vacuum, and the latter
depends only on the values of the Higgs and top masses (M_H
and M_t). However, it has been recently demonstrated that
new physics interactions, even if they show up only at
very high energies, can strongly affect the vacuum stability
condition. As a consequence, the stability diagram of the
Standard Model can be very different from the well known
diagram (obtained ignoring new physics at the Planck scale)
usually presented. This result has far reaching theoretical
and phenomenological consequences. In particular, contrary to
what is usually stated, higher precision measurements of
M_t (and M_H) will not be able to tell us whether our universe
lives in a stable or metastable vacuum state (or at the edge
of stability).
Auteur principal
Prof.
Vincenzo Branchina
(University of Catania)
