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Upper Bound of Proton Life-Time in Product-Group Unification
Models of supersymmetric grand unified theories based on SU(5)_GUT \times U(N)_H gauge group (N = 2,3) have a symmetry that guarantees light two Higgs doublets and absence of dimension-five proton decay operators. We analysed the proton decay induced by gauge-boson exchange in the models. Upper boun...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
2003
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.67.114021 http://cds.cern.ch/record/609169 |
Sumario: | Models of supersymmetric grand unified theories based on SU(5)_GUT \times U(N)_H gauge group (N = 2,3) have a symmetry that guarantees light two Higgs doublets and absence of dimension-five proton decay operators. We analysed the proton decay induced by gauge-boson exchange in the models. Upper bounds of proton life-time are obtained; \tau(p\to \pi^0e^+) \lsim 6.0 \times 10^{33} yrs. in the SU(5)_GUT \times U(2)_H model and \tau(p\to \pi^0e^+) \lsim 5.3 \times 10^{35} yrs. in the SU(5)_GUT \times U(3)_H model. Various uncertainties in the predictions are also discussed. |
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