Non-unitary Leptonic Mixing and Leptogenesis

Abstract

We investigate the relation between non-unitarity of the leptonic mixing matrix and leptogenesis. We discuss how all parameters of the canonical type-I seesaw mechanism can, in principle, be reconstructed from the neutrino mass matrix and the deviation of the effective low-energy leptonic mixing matrix from unitary. When the mass M' of the lightest right-handed neutrino is much lighter than the masses of the others, we show that its decay asymmetries within flavour-dependent leptogenesis can be expressed in terms of two contributions, one depending on the unique dimension five (d=5) operator generating neutrino masses and one depending on the dimension six (d=6) operator associated with non-unitarity. In low-energy seesaw scenarios where small lepton number violation explains the smallness of neutrino masses, the lepton number conserving d=6 operator contribution generically dominates over the d=5 operator contribution which results in a strong enhancement of the flavour-dependent decay asymmetries without any resonance effects. To calculate the produced final baryon asymmetry, the flavour equilibration effects directly related to non-unitarity have to be taken into account. In a simple realization of this non-unitarity driven leptogenesis, the lower bound on M' is found to be about 10^8 GeV at the onset of the strong washout regime, more than one order of magnitude below the bound in "standard" thermal leptogenesis.

19 pages, REVTeX4, 2 eps and 2 axodraw figures

References in corpus (12)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Leptogenesis
• Low energy effects of neutrino masses
• Unitarity of the Leptonic Mixing Matrix
• Non-Standard Neutrino Interactions with Matter from Physics Beyond the Standard Model
• Minimal Flavour Seesaw Models
• Constraints on the Reheating Temperature in Gravitino Dark Matter Scenarios
• CP-violation from non-unitary leptonic mixing
• New aspects of leptogenesis bounds
• CP violation in neutrino oscillations and new physics
• Leptogenesis without violation of B-L
• Searching for New Physics in Future Neutrino Factory Experiments

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• Leptogenesis in the two right-handed neutrino model revisited
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• Parametrization of Seesaw Models and Light Sterile Neutrinos
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• CP violation in bipair neutrino mixing
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• Symmetry in neutrino oscillation in matter with non-unitarity
• Completing RHINO
• Non-resonant leptogenesis in seesaw models with an almost conserved B-L