Common Origin for CP Violation in Cosmology and in Neutrino Oscillations

Abstract

We suggest predictive scenarios for neutrino masses which provide a common origin for CP violation in early universe cosmology and in neutrino oscillations. Our setup is the seesaw mechanism in the context of MSSM with two quasi-degenerate right-handed neutrinos, with baryon asymmetry generated via resonant leptogenesis. Three different models are found with specific textures in the Yukawa coupling matrices, each with a single phase which controls leptogenesis and neutrino CP violation. One model leads to normal hierarchy of light neutrino masses and the prediction tan theta_13 = sin theta_12 \sqrt{m_2/m_3}, resulting in a value of the reactor mixing angle theta_13 very close to the current experimental lower limit. The other two models predict inverted hierarchical neutrino mass spectrum with the sum rules sin^2 theta_12 = 1/2-tan theta_23 sin theta_ 13 cos delta and sin^2 theta_12 = 1/2+cot theta_23 sin theta_13 cos delta respectively. We obtain a lower bound for the phase |delta| in the normal hierarchical model, and a narrow range for |delta| for the inverted hierarchical model from cosmology. In our scenario, the mass-splitting between the quasi-degenerate right-handed neutrinos arise via renormalization group flow, which provides a lower limit on the MSSM parameter tan beta > 12. The right-handed neutrino masses can be as low as TeV, which would avoid the gravitino problem generic to supersymmetric models.

arXiv comment20 pp LaTeX, 6 eps figures

References in corpus (2)

• Minimal Seesaw Textures with Two Heavy Neutrinos
• Texture zeroes and discrete flavor symmetries in light and heavy Majorana neutrino mass matrices: a bottom-up approach

Cited by in corpus (7)

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• 'Mu-Tau' symmetry, tribimaximal mixing and four zero neutrino Yukawa textures
• Hybrid textures in minimal seesaw mass matrices
• Texture Zero Neutrino Models and Their Connection with Resonant Leptogenesis
• Neutrino Mass Matrices from Two Zero 3x2 Yukawa Textures and Minimal d=5 Entries
• Calculable Cosmological CP Violation and Resonant Leptogenesis
• Particular textures of the minimal seesaw model