New model for fermion masses in supersymmetric grand unified theories

Gravitational corrections to fermion masses in grand unified theories

There are several hints that the strong and electroweak forces unify at some very large energy typically assumed to be at around 10 GeV. The quantum fields of the standard model fit nicely into simple representations of a grand unified theory [1] such as e.g. SUð5Þ or SOð10Þ. The idea of unification is extremely attractive for several reasons. For example, a grand unification drastically reduce...

Constraints on SUSY Masses in Supersymmetric Grand Unified Theories

Within the Minimal Supersymmetric Grand Unified Theory (MSGUT) masses of the predicted supersymmetric particles are constrained by the world averaged values of the electroweak and strong coupling constants, the lower limits on the proton lifetime, the lower limit on the lifetime of the universe, which implies an upper limit on the dark matter density, the electroweak symmetry breaking originati...

Small Dirac Neutrino Masses in Supersymmetric Grand Unified Theories

A simple mechanism to generate Dirac masses for the neutrinos in SU(5) supersymmetric grand unified theory is proposed. The tiny Dirac masses are induced by the small mixing between the Higgs fields and another superheavy fields. The mixing terms are obtained by the same mechanism as the μ-term generation of the order of the supersymmetry breaking scale, so that the mixing of order TeV/MGUT ∼ 1...

Supersymmetric Grand Unified Theories and Yukawa Unification

Status of Supersymmetric Grand Unified Theories

We begin with a brief discussion of the building blocks of supersymmetric grand unified theories. We recall some of the compelling theoretical reasons for viewing supersymmetric grand unification as an attractive avenue for physics beyond the standard model. This is followed by a discussion of some of the circumstantial evidence for these ideas. Invited Speaker at the XII DAE Symposium on High ...