Seesaw mechanism in quark-lepton complementarity

Journal Article · Sat Dec 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.113003· OSTI ID:21023908

Plentinger, Florian; Seidl, Gerhart; Winter, Walter ^[1]

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1. Institut fuer Theoretische Physik und Astrophysik, Universitaet Wuerzburg, D-97074 Wuerzburg (Germany)

We systematically construct realistic mass matrices for the type-I seesaw mechanism out of more than 20x10{sup 12} 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 parametrized by a single small quantity {epsilon} that is of the order of the Cabibbo angle {epsilon}{approx_equal}{theta}{sub C}. The small quantity {epsilon} also describes all fermion mass hierarchies. We show that special cases often considered in the literature, such as having a symmetric Dirac mass matrix or small mixing among charged leptons, constitute only a tiny fraction of our possibilities. Moreover, we find that in most cases the spectrum of right-handed neutrino masses is only mildly hierarchical. As a result, we provide for the charged leptons and neutrinos a selected list of 1981 qualitatively different Yukawa coupling matrices (or textures) that are parametrized by the Cabibbo angle and allow for a perfect fit to current data. In addition, we also briefly show how the textures could be generated in explicit models from flavor symmetries.

• OSTI ID: 21023908
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CABIBBO ANGLE
EIGENSTATES
FLAVOR MODEL
MATRICES
NEUTRINOS
QUARKS
REST MASS
STANDARD MODEL
SYMMETRY
WEINBERG ANGLE
YUKAWA POTENTIAL