Since the discovery of the Higgs boson at LHC, experimentalists and theorists have studied its properties in the hope of finding some hints of new physics. Unfortunately the data appear to converge toward Standard Model predictions. For this reason we can think to extend the SM beyond its “natural” range of energy, but in that case we need to address, among other issues, the problem of the stability of the electro-weak vacuum. Indeed the measured Higgs and Top masses put the SM in a near-critical situation, where the minimum of the EW vacuum is in a meta-stable phase.
In the first part, I will present the fits to some popular BSM theories, with a particular emphasis to the fact that the best fit regions always lie along the SM predictions.
The second part, on the other hand, will be dedicated to the stability of the EW vacuum.