Leptogenesis from the Asymmetric Texture

TL;DR

This paper explores how a specific asymmetric texture in an $SU(5) imes ext{T}_{13}$ model can explain the universe's baryon asymmetry through non-resonant thermal leptogenesis, linking CP violation to neutrino mixing phases.

Contribution

It demonstrates that the baryon asymmetry can be generated in this model only when flavor effects are included, connecting leptogenesis with a single CP-violating phase in the seesaw mechanism.

Findings

Baryon asymmetry explained with right-handed neutrino masses of 10^9-10^12 GeV.

The sign of asymmetry correlates with the Dirac CP phase, consistent with experimental data.

The model predicts a Dirac CP phase magnitude of 1.32π, aligning with global fit results.

Abstract

We investigate non-resonant thermal leptogenesis in the context of the $SU(5) \times \mathcal{T}_{13}$ "asymmetric texture", where both Dirac and Majorana ${CP}$ violation arise from a single phase in the tribimaximal seesaw mixing matrix. We show that the baryon asymmetry of the universe can be explained in this model only when flavor effects are considered for right-handed neutrino masses of $\mathcal{O}(10^9 - 10^{12})$ $\text{GeV}$. The sign of the baryon asymmetry also determines the sign of the previously predicted Dirac $\require{cancel}\cancel{CP}$ phase $|\delta_{CP}| = 1.32\pi$, consistent with the latest global fit $\delta_{CP}^{PDG} = 1.37 \pm 0.17\pi$.