6533b7dafe1ef96bd126e39d
RESEARCH PRODUCT
Tri/Bi-maximal lepton mixing and leptogenesis
I. De Medeiros VarzielasFederica BazzocchiStefano MorisiD. Aristizabal SierraLuca Merlosubject
PhysicsNuclear and High Energy PhysicsParticle physics/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energy010308 nuclear & particles physicsmedia_common.quotation_subjectHigh Energy Physics::PhenomenologyFOS: Physical sciences01 natural sciencesAsymmetrySymmetry (physics)Standard Model (mathematical formulation)High Energy Physics - PhenomenologyBaryon asymmetryHigh Energy Physics - Phenomenology (hep-ph)Gauge groupLeptogenesis0103 physical sciencesCP violationHigh Energy Physics::ExperimentSDG 7 - Affordable and Clean Energy010306 general physicsMixing (physics)media_commonParticle Physics - Phenomenologydescription
In models with flavour symmetries added to the gauge group of the Standard Model the CP-violating asymmetry necessary for leptogenesis may be related with low-energy parameters. A particular case of interest is when the flavour symmetry produces exact Tri-Bimaximal lepton mixing leading to a vanishing CP-violating asymmetry. In this paper we present a model-independent discussion that confirms this always occurs for unflavoured leptogenesis in type I see-saw scenarios, noting however that Tri-Bimaximal mixing does not imply a vanishing asymmetry in general scenarios where there is interplay between type I and other see-saws. We also consider a specific model where the exact Tri-Bimaximal mixing is lifted by corrections that can be parametrised by a small number of degrees of freedom and analyse in detail the existing link between low and high-energy parameters - focusing on how the deviations from Tri-Bimaximal are connected to the parameters governing leptogenesis.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-08-06 |