Systematic Parameter Space Search of Extended Quark-Lepton Complementarity

Abstract

We systematically investigate the parameter space of neutrino and charged lepton mass matrices for textures motivated by an extended quark-lepton complementarity. As the basic hypothesis, we postulate that all mixing angles in U_l and U_nu be either maximal or described by powers of a single small quantity epsilon ~ theta_C. All mass hierarchies are described by this epsilon as well. In this study, we do not assume specific forms for U_l and U_nu, such as large mixing coming from the neutrino sector only. We perform a systematic scan of the 262,144 generated mixing matrices for being compatible with current experimental data, and find a sample of 2,468 possibilities. We then analyze and classify the effective charged lepton and neutrino mass textures, where we especially focus on a subset of models getting under pressure for small theta_13. In addition, we predict the mixing angle distributions from our sample of all valid textures, and study the robustness of this prediction. We also demonstrate how our procedure can be extended to predictions of the Dirac and Majorana phases in U_PMNS. For instance, we find that CP conservation in neutrino oscillations is preferred, and we can impose a lower bound on the mixing matrix element for neutrinoless double beta decay.

37 pages, 9 figures. Small error in Eq. (36) corrected, and Figs. 8 and 9 updated. Final version matched to Nuclear Physics B version. A detailed list of our textures compatible with current data can be obtained at http://theorie.physik.uni-wuerzburg.de/~winter/Resources/Textures/index.html

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