Nagoya University: Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI)

Nagoya University

Japanese


KMI/EHQG Joint Seminar
"Resurrecting the minimal renormalizable supersymmetric SU(5) model"
Borut Bajc
(Institut Jozef Stefan)
November 10, 2015 (Tue) 17:00-
KMI Science Symposia (ES635)
Abstract:

It is a well-known fact that the minimal renormalizable supersymmetric SU(5) model is ruled out assuming superpartner masses of the order of a few TeV. Giving up this constraint and assuming only SU(5) boundary conditions for the soft terms, we find that the model is still alive. The viable region of the parameter space typically features super partner masses of order 10^2 to 10^4 TeV, with tan(beta) values between 2 and 5, but lighter spectra with single states around 10 TeV are also possible. The main constraints come from proton decay, the Higgs mass, the requirement of the SU(5) spectrum being reasonably below the Planck scale, and the lifetime of the universe. A generic feature of the model is metastability of the electroweak vacuum. In the absence of a suitable dark matter particle in the neutralino sector, a light (order GeV or smaller) gravitino is a natural candidate.