Missing doublet model reexamined
- Center for Theoretical Physics, Department of Physics, Texas A&M University, College Station, Texas 77843-4242 (United States)
We reexamine the missing doublet model (MDM) as a means to address the apparent difficulties of the minimal SU(5) supergravity model in dealing with the doublet-triplet splitting problem, the prediction of {alpha}{sub 3}({ital M}{sub {ital Z}}), and the proton lifetime. We revamp the original MDM by extending its observable sector to include fields and interactions that naturally suppress the dimension-five proton decay operators and that allow seesaw neutrino masses. We also endow the model with a hidden sector which (via gaugino condensation) triggers supersymmetry breaking of the desired magnitude, yields (via hidden matter condensation) a new dynamical intermediate scale for the right-handed neutrino masses ({approximately}10{sup 10} GeV), and provides an effective Higgs mixing parameter {mu}. The model is consistent with gauge coupling unification for experimentally acceptable values of {alpha}{sub 3}({ital M}{sub {ital Z}}), and with proton decay limits even for large values of tan{beta}. The right-handed neutrinos can be produced subsequent to inflation, and their out-of-equilibrium decays induce a lepton asymmetry which is later reprocessed (via sphaleron interactions) into a baryon asymmetry at the electroweak scale. The resulting seesaw neutrino masses provide a candidate for the hot dark matter component of the Universe ({ital m}{sub {nu}{tau}}{approximately}10eV) and are consistent with the MSW solution to the solar neutrino problem. We finally compare the features of this traditional GUT model with that of the readily string-derivable SU(5){times}U(1) model, and discuss the prospects of deriving the revamped MDM from string theory. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Texas A&M Research Foundation
- DOE Contract Number:
- FG05-91ER40633
- OSTI ID:
- 279185
- Journal Information:
- Physical Review, D, Vol. 53, Issue 5; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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