GUTs without guts

SUSY GUTs without light Higgs bosons

There are two different types of perturbative unification in SUSY GUTs. Perturbative gauge unification is necessary for the extremely successful prediction of sin θw. “Perturbative validity” requires that all couplings (not just the gauge couplings) remain small; this assumption is essential to the proof that any SUSY GUT must have a light Higgs with a mass below 140 GeV. It is pointed out here...

Evidence For SUSY From GUTS? Evidence For GUTS From SUSY!

We review the theoretical and experimental status of minimal grand unified theories (GUTS), contrasting the failure of minimal non-supersymmetric SU(5) with the success of the minimal supersymmetric SU(5) and minimal supersymmetric Flipped SU(5)× U(1) models. We show that a reasonable value for the universal soft supersymmetry-breaking gaugino mass, 45GeV < m1/2 < 1TeV, and a 1−σ range of the o...

Guts Round Questions

Simple GUTs 1

Together with some positive features, such as the constrained hypercharge assignments , grandunification models typically have some unwelcome aspects, mostly associated with the rich and peculiarly selected matter content. I discuss some ideas which might help to interpret (part of) this apparent complexity arising in grandunification in terms of simple structures. I also point out that the con...

A god for guts.