A Relation between theta-13 and the Leptonic Dirac CP Phase in SO(10) Lopsided Models

TL;DR

This paper explores a specific relation between the neutrino mixing angle theta-13 and the leptonic Dirac CP phase within SO(10) models featuring lopsided charged-lepton mass matrices, supported by a predictive model.

Contribution

It establishes a characteristic link between theta-13 and the Dirac CP phase in a class of SO(10) models with lopsided charged-lepton masses, providing a new predictive framework.

Findings

Identifies a specific relation between theta-13 and the CP phase.

Demonstrates this relation in a realistic SO(10) model.

Provides predictions for neutrino mixing parameters.

Abstract

It is shown that in SO(10) models where the large solar and atmospheric neutrino angles come from the charged-lepton mass being "lopsided", there is a characteristic relation between the 13 mixing angle of the neutrinos and the size of the Dirac CP- violating phase in the lepton sector. This is illustrated in a recently proposed realistic and predictive model.