Leptonic CP Violation from a New Perspective

TL;DR

This paper introduces a new parametrization of leptonic mixing for Majorana neutrinos, revealing scenarios with large CP violation and potential simplifications in quasi-degenerate cases, offering fresh insights into leptonic CP violation.

Contribution

It proposes a novel parametrization of leptonic mixing that highlights important CP violation scenarios and simplifies model analysis for quasi-degenerate neutrinos.

Findings

Identifies scenarios with large leptonic CP violation.

Provides a new parametrization less clear in standard form.

Useful for models with quasi-degenerate neutrinos.

Abstract

We study leptonic CP violation from a new perspective. For Majorana neutrinos, a new parametrization for leptonic mixing of the form $V=O_{23} O_{12} K_{a}^{i}\cdot O$ reveals interesting aspects that are less clear in the standard parametrization. We identify several important scenario-cases with mixing angles in agreement with experiment and leading to large leptonic CP violation. If neutrinos happen to be quasi-degenerate, this new parametrization might be very useful, e.g., in reducing the number of relevant parameters of models.