A supersymmetric grand unified theory of flavour with

Supersymmetric Grand Unified Models Without

We discuss two classes of supersymmetric grand unified theories based on extended gauge groups SO(10) × SO(10) and SO(10)× SO(10)× SO(10). Effective adjoint fields of each gauge group SO(10) are argued to be formed from combining two Higgs fields in fundamental representation of the extended gauge groups, one obtaining its VEV along the diagonal SO(10)D direction and the other acquiring its VEV...

Grand Unified Theories and Lepton - Flavour Violation

Lepton-flavour violating processes, such as µ → eγ, are studied in ordinary (non-SUSY) SU(5) and SUSY SU(5) grand unified theories. First given are some introductory argument on the mechanism of U.V. divergence cancellation in flavour changing neutral current processes and on the decoupling of particles with GUT scale masses. We next see that such general argument is confirmed by an explicit ca...

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 ...

Flavour in supersymmetric Grand Unification: a democratic approach

We consider the flavour problem in a supersymmetric Grand Unified theory with gauged SU(6) group, where the Higgs doublets are understood as pseudo-Goldstone bosons of a larger SU(6) ⊗ SU(6) global symmetry of the Higgs superpotential. A key element of this work is that we never appeal to any flavour symmetry. One main interesting feature emerges: only one of the light fermions, an up-type quar...

Supersymmetric Grand Unified Theories and Yukawa Unification