Quark lepton complementarity in unified theories

Antusch, S., King, S.F. and Mohapatra, R.N. (2005) Quark lepton complementarity in unified theories. Physics Letters B, 618 (1-4), 150-161. (doi:10.1016/j.physletb.2005.05.026).

Record type: Article

Abstract

As pointed out by many authors, recent observations are consistent with an intriguing relation between the Cabibbo angle θ_C and the solar neutrino mixing angle θ₁₂, namely θ₁₂ ~ π/4 - θ_C. Such quark–lepton complementarity (QLC) may be a signal of an underlying quark–lepton unification at short distances. We discuss possible ways to realize this relation in realistic quark–lepton unification theories by identifying a minimal set of operators that lead to QLC while remaining consistent with other known data. The purpose of this Letter is to present the first elements of a unified model at the GUT scale capable of predicting the QLC relation. A generic prediction of our proposed class of models is the new relation for the lepton mixing angle θ₁₃ ~ θ_C, which allows these models to be confirmed or excluded by the current generation of neutrino oscillation experiments.

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