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Quark-Lepton Complementarity in Unified Theories

Stefan Antusch·Steve F. King·Rabindra N. Mohapatra
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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 $θ_{12}$, namely $θ_{12} \simeq π/4 - θ_C$. 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 paper 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 $θ_{13} \simeq θ_C$, which allows these models to be confirmed or excluded by the current generation of neutrino oscillation experiments.

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Stefan Antusch, Steve F. King, Rabindra N. Mohapatra. 2005-07-28. Quark-Lepton Complementarity in Unified Theories. https://doi.org/10.1016/j.physletb.2005.05.026

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