On the Consistency of Perturbativity and Gauge Coupling Unification - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: We investigate constraints that the requirements of perturbativity and gaugecoupling unification impose on extensions of the Standard Model and of theMSSM. In particular, we discuss the renormalization group running in severalSUSY left-right symmetric and Pati-Salam models and show how the various scalesappearing in these models have to be chosen in order to achieve unification. Wefind that unification in the considered models occurs typically at scales belowM^{min} {B violation} = 10^16 GeV, implying potential conflicts with thenon-observation of proton decay. We emphasize that extending the particlecontent of a model in order to push the GUT scale higher or to achieveunification in the first place will very often lead to non-perturbativeevolution. We generalize this observation to arbitrary extensions of theStandard Model and of the MSSM and show that the requirement of perturbativityup to M^{min} {B violation}, if considered a valid guideline for modelbuilding, severely limits the particle content of any such model, especially inthe supersymmetric case. However, we also discuss several mechanisms tocircumvent perturbativity and proton decay issues, for example in certainclasses of extra dimensional models.



Author: Joachim Kopp, Manfred Lindner, Viviana Niro, Thomas E. J. Underwood

Source: https://arxiv.org/







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