Upper Bound of Proton Lifetime in Product-Group Unification
High Energy Physics - Phenomenology
2009-11-10 v3
Abstract
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 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 lifetime 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.
Keywords
Cite
@article{arxiv.hep-ph/0303123,
title = {Upper Bound of Proton Lifetime in Product-Group Unification},
author = {Masahiro Ibe and T. Watari},
journal= {arXiv preprint arXiv:hep-ph/0303123},
year = {2009}
}
Comments
36 pages, including 4 tables and 5 figures, minor corrections