Lepton mixing induced by flavour symmetry and Leptogenesis constraints

TL;DR

This paper explores how deviations from exact lepton mixing schemes, induced by flavour symmetry, can generate CP-violating asymmetries relevant for leptogenesis, linking low-energy parameters to the matter-antimatter asymmetry.

Contribution

It introduces a model connecting deviations from mass-independent lepton mixing to leptogenesis, highlighting the role of flavour symmetry corrections.

Findings

Deviations from exact mixing schemes can produce non-zero CP asymmetry.

The model establishes a direct link between low-energy mixing parameters and leptogenesis.

Corrections to flavour symmetry are crucial for viable leptogenesis scenarios.

Abstract

Flavour models may display a relation between the CP-violating asymmetry for leptogenesis and low-energy parameters. If the flavour symmetry produces an exact mass independent lepton mixing scheme at leading order (with type I see-saw) the CP-violating asymmetry would vanish in the absence of corrections. We present a model displaying the link between deviations from the mixing scheme and leptogenesis.