Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-01-11
JHEP0503:054,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
36 pages, 11 figures
Scientific paper
10.1088/1126-6708/2005/03/054
We provide detailed estimates of the proton lifetime in the context of simple supersymmetric SU(5) grand unified models with an extra compact spatial dimension, described by the orbifold S/(Z_2 x Z_2') and by a large compactification scale Mc. We focus on a class of models where the grand unified symmetry is broken by the compactification mechanism and where baryon violation proceeds mainly through gauge vector boson exchange so that the proton lifetime scales as the fourth power of Mc. We carefully compute Mc from a next-to-leading analysis of gauge coupling unification and we find that Mc can only be predicted up to an overall factor one hundred. The simplest model, where the dominant decay mode is (pi^0 e+) and has no flavour suppression, is strongly constrained by existing data, but not totally ruled out. We also analyze models where some of the matter fields are localized in the extra space and proton decay is flavour suppressed. In models associated to anarchy in the neutrino sector the preferred decay channel is (K+ {\bar \nu}) and the lifetime can be within the reach of the next generation of experiments.
Alciati Maria Laura
Feruglio Ferruccio
Lin Yin
Varagnolo Alvise
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