Stability, Higgs boson mass, and new physics.
Assuming that the particle with mass ∼126  GeV discovered at LHC is the standard model Higgs boson, we find that the stability of the electroweak (EW) vacuum strongly depends on new physics interaction at the Planck scale MP, despite of the fact that they are higher-dimensional interactions, apparently suppressed by inverse powers of MP. In particular, for the present experimental values of the top and Higgs boson masses, if τ is the lifetime of the EW vacuum, new physics can turn τ from τ≫TU to τ≪TU, where TU is the age of the Universe, thus, weakening the conclusions of the so called metastability scenario.
Department of Physics, University of Catania and INFN, Sezione di Catania, Via Santa Sofia 64, I-95123 Catania, Italy.
Vincenzo
V
Branchina
Department of Physics, University of Catania and INFN, Sezione di Catania, Via Santa Sofia 64, I-95123 Catania, Italy.
Emanuele
E
Messina