Systematic parameter space search of extended quark–lepton complementarity Original Research Article

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 image and image be either maximal or described by powers of a single small quantity image. All mass hierarchies are described by this ϵ as well. In this study, we do not assume specific forms for image and image, such as large mixing coming from the neutrino sector only. We perform a systematic scan of the image generated mixing matrices for being compatible with current experimental data, and find a sample of 2468 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 image. 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 image. 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 image decay.