Large Neutrino Mixing in Grand Unified Theories
Abstract
Description
A non-minimal, semi-realistic version of supersymmetric SU(5) grand unified theory is discussed. The solution of the doublet-triplet splitting problem leads to a better agreement between the predicted and observed values of the low-energy strong coupling constant and to a prolongation of the proton lifetime. A U(1) flavor symmetry allows to accommodate a realistic mass spectrum in the charged and in the neutral fermion sectors and protects doublet-triplet splitting and proton decay from dangerous radiative corrections or non-renormalizable operators.
LaTex, 4 pages, talk given at the Cairo International Conference on High Energy Physics, Cairo, Egypt, 9-14 January 2001 and at the XXXth International Conference on High Energy Physics (ICHEP2000), Osaka, July 27-August 2, 2000
LaTex, 4 pages, talk given at the Cairo International Conference on High Energy Physics, Cairo, Egypt, 9-14 January 2001 and at the XXXth International Conference on High Energy Physics (ICHEP2000), Osaka, July 27-August 2, 2000