PREDICTIONS FROM NON-TRIVIAL QUARK-LEPTON COMPLEMENTARITY

On quark-lepton complementarity

Recent measurements of the neutrino solar mixing angle and the Cabibbo angle satisfy the empirical relation θsol + θC ≃ 4 . This relation suggests the existence of a correlation between the mixing matrices of leptons and quarks, the so called quark-lepton complementarity. Here, we examine the possibility that this correlation originates in the strong hierarchy in the mass spectra of quarks and ...

Quark-lepton Symmetry and Complementarity

The Seesaw Mechanism in Quark - Lepton Complementarity

We systematically construct realistic mass matrices for the type-I seesaw mechanism out of more than 20 trillion possibilities. We use only very generic assumptions from extended quark-lepton complementarity, i.e., the leptonic mixing angles between flavor and mass eigenstates are either maximal, or parameterized by a single small quantity ǫ that is of the order of the Cabibbo angle ǫ ≃ θC. The...

Quark-Lepton Complementarity in Unified Theories

As pointed out by many authors, recent observations are consistent with an intriguing relation between the Cabibbo angle θC and the solar neutrino mixing angle θ12, namely θ12 ≃ π/4 − θC. 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 the...

Ambiguities Pertaining to Quark-lepton Complementarity

Recently the possible origin of the so-called quark-lepton complementarity relations has received a considerable amount of attention. We point out some of the inherent ambiguities in such analyses.