Running neutrino masses and mixing in a SU(4) x SU(2)^2 x U(1)_X model

Abstract

In this talk, we discuss the implications of the renormalization group equations for the neutrino masses and mixing angles in a supersymmetric string-inspired SU(4) x SU(2)_L x SU(2)_R x U(1)_X model with matter in fundamental and antisymmetric tensor representations only. The quark, charged lepton and neutrino Yukawa matrices are distinguished by different Clebsch-Gordan coefficients due to contracting over SU(4) and SU(2)_R indices. In order to permit for a more realistic, hierarchical light neutrino mass spectrum with bi-large mixing a second U(1)_X breaking singlet with fractional charge is introduced. By numerical investigation we find a region in the model parameter space where the neutrino mass-squared differences and mixing angles at low energy are consistent with experimental data.

Talk presented at the Corfu Summer Institute, Corfu-Greece, September 4-14, 2005

References in corpus (12)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Running Neutrino Mass Parameters in See-Saw Scenarios
• Solar Neutrinos Before and After Neutrino 2004
• Quark-Lepton Complementarity in Unified Theories
• Possible Gauge Theoretic Origin for Quark-Lepton Complementarity
• Running Neutrino Masses, Leptonic Mixing Angles and CP-Violating Phases: From $M_{\mathrm{Z}}$ to ${\Lambda }_{\mathrm{GUT}}$
• Neutrinoless Double Beta Decay and Future Neutrino Oscillation Precision Experiments
• Theoretical Prospects of Neutrinoless Double Beta Decay
• Running of Low-Energy Neutrino Masses, Mixing Angles and CP Violation
• Fermion masses and proton decay in string-inspired SU(4)*SU(2)^2*U(1)_X
• Systematic Study Of Leptonic Mixing In A Class Of SU_H(2) Models
• Neutrino Masses: Shedding Light on Unification and Our Origin