Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-14
PoS EPS-HEP2009 2009:384,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Submitted to the proceedings of the 2009 Europhysics Conference on High Energy Physics, July 16 - 22, 2009, Krakow, Poland
Scientific paper
It is often argued that in the class of non-supersymmetric SO(10) grand unified theories there is barely any room for reconciling the lower bound on the position of the GUT scale emerging from the proton decay searches and the lower limit on the absolute neutrino mass scale derived from the neutrino oscillation experiments with the gauge coupling unification constraints. The recent two-loop reassessment of the gauge running provides the first complete picture of the situation, complementing the existing studies in several aspects. The improved analysis reveals a new room in the parametric space that could support a class of non-supersymmetric SO(10) models potentially compatible with all current physical data, including constraints on the relevant Yukawa sector emerging from the quark and lepton masses and mixings. This, in turn, brings back the question of viability of some of the simplest non-supersymmetric GUT scenarios.
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