A KIND OF PREDICTION FROM SUPERSTRING MODEL BUILDING

by Carlos MUNOZ (CERN & U. Autonoma Madrid)

Thursday 29 Nov 2001, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

The heterotic string has been one of the leading candidates to accommodate the observed low-energy world. Unfortunately, the unification scale predicted by this theory ($\approx g_{GUT}\times 5.27\cdot 10^{17}$ GeV) and the value deduced from LEP experiments ($\approx 2\cdot 10^{16}$ GeV) do not coincide. Assuming that the Standard Model arises from heterotic string constructions, we try to solve this discrepancy. A crucial ingredient in the solution is the presence at low energies of three generations of supersymmetric Higgses and vector-like colour triplets. As a by-product this analysis gives rise to a strategy which might be useful when constructing realistic models.