Sizeable \theta_13 from the Charged Lepton Sector in SU(5), (Tri-)Bimaximal Neutrino Mixing and Dirac CP Violation

TL;DR

This paper demonstrates how a large reactor angle _13 can originate solely from the charged lepton sector within an SU(5) GUT framework, maintaining (tri-)bimaximal neutrino mixing and exploring CP violation implications.

Contribution

It introduces a novel SU(5) GUT model where the charged lepton sector accounts for a large _13, preserving (tri-)bimaximal neutrino mixing and analyzing CP violation effects.

Findings

Large _13 can originate from charged leptons in SU(5) models.

(Tri-)bimaximal neutrino mixing remains viable with large _13.

Implications for CP violation searches in neutrino oscillations.

Abstract

The recent results from T2K and MINOS experiments point towards a relatively large value of the reactor angle \theta_13 in the lepton sector. In this paper we show how a large \theta_13 can arise from the charged lepton sector alone in the context of an SU(5) GUT. In such a scenario (tri-)bimaximal mixing in the neutrino sector is still a viable possibility. We also analyse the general implications of the considered scenario for the searches of CP violation in neutrino oscillations.