Anomalous U(1) symmetry and missing doublet SU(5) model

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dc.creatorBerezhiani, Zurab
dc.creatorTavartkiladze, Zurab
dc.date1996-11-11
dc.date.accessioned2026-07-07T10:33:25Z
dc.date.available2026-07-07T10:33:25Z
dc.descriptionWe present the supersymmetric $SU(5)$ models which provide a simple ``all order'' solution to the doublet-triplet splitting problem through the missing doublet mechanism. The crucial role is played by the anomalous $U(1)_A$ gauge symmetry and no additional discrete or global symmetries are needed. Remarkably, such models can be realized even if the 75-plet Higgs is replaced by the standard 24-plet. The same $U(1)_A$ symmetry can also guarantee an exact or approximate conservation of R parity, by suppressing the B and L violating operators to the needed level. The neutrino masses and the proton decay via $d=5$ operators are also examined. We also extend the model by incorporating $U(1)_A$ as a horizontal symmetry for explaining the fermion mass and mixing hierarchy. Interestingly, in this scheme the necessary mild violation of the troublesome $SU(5)$ degeneracy between the down quark and the charged lepton masses can be induced by certain R-parity violating operators.
dc.description16 pages, LATEX, no figures
dc.identifierhttps://arxiv.org/abs/hep-ph/9611277
dc.identifierhttp://arxiv.org/abs/hep-ph/9611277
dc.identifierPhys.Lett.B396:150-160,1997
dc.identifierdoi:10.1016/S0370-2693(97)00122-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179101
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleAnomalous U(1) symmetry and missing doublet SU(5) model
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