Partial quark-lepton universality and neutrino CP violation

TL;DR

This paper explores a grand unified theory-inspired model with partial quark-lepton universality, linking it to neutrino CP violation, and predicts a narrow range for the Dirac CP phase based on current mixing data.

Contribution

It introduces a model connecting quark and lepton sectors with a single CP phase constraint, providing a novel prediction for neutrino CP violation.

Findings

Predicted Dirac CP phase range: -32.4° to 32.0° at 2σ

Reduced model constraints to a single condition on δ

Supports partial quark-lepton universality in GUT frameworks

Abstract

We study a model with partial quark-lepton universality that can naturally arise in grand unified theories. We find that constraints on the model can be reduced to a single condition on the Dirac CP phase $\delta$ in the neutrino sector. Using our current knowledge of the CKM and PMNS mixing matrices, we predict $-32.4^\circ < \delta < 32.0^\circ$ at $2\sigma$.