Light threshold effects in supersymmetric Grand Unified Theories

Light Threshold Effects in Supersymmetric Grand Unified Theories

Supersymmetric Grand Unified Theories have a rich spectrum of particles barely heavier than the intermediate vector bosons. As their non-supersymmetric counterparts, they lead to many relations among low energy observables. But the precise form of the predictions is modified by the extended spectrum. If the masses of these new particles are comparable to MZ , the standard computation of their e...

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 ...

Light thresholds in Grand Unified Theories

In a generic Grand Unified Theory with a relatively small dispersion of the spectrum around the Z-boson and the unification masses, a connection is established, exact at one loop level, between MZ , GF, α(MZ) and the strong coupling constant α3(MZ). At this level of precision, this avoids the logical and phenomenological inconsistency of predicting α3(MZ) by means of the electroweak couplings a...

Nonabelian Duality and Higgs Multiplets in Supersymmetric Grand Unified Theories

We consider strongly interacting supersymmetric gauge theories which break dynamically the GUT symmetry and produce the light Higgs doublets naturally. Two models we proposed in the previous articles are reanalyzed as two phases of one theory and are shown to have desired features. Furthermore, employing nonabelian duality proposed recently by Seiberg, we study the dual theory of the above one ...