Strong Unification

Details Strong Unification Strong Unification

1997-07-25

arxiv.org/abs/hep-ph/9707462v2

Phys.Lett.B415:253,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LateX, no figures

Scientific paper

10.1016/S0370-2693(97)01148-9

We investigate the possibility that unification occurs at strong coupling. We show that, despite the fact the couplings pass through a strong coupling regime, accurate predictions for their low energy values are possible because the couplings of the theory flow to infrared fixed points. We determine the low-energy QCD coupling in a favoured class of strong coupling models and find it is reduced from the weak coupling predictions, lying close to the experimentally measured value. We extend the analysis to the determination of quark and lepton masses and show that (even without Grand Unification) the infra-red fixed point structure may lead to good predictions for the top mass, the bottom to tau mass ratio and $\tan \beta $. Finally we discuss the implications for the unification scale finding it to be increased from the MSSM value and closer to the heterotic string prediction.

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