Leptogenesis from the Asymmetric Texture

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 ${\delta }_{CP}^{PDG}=1.37\pm 0.17\pi$.

31 pages, 6 figures, major revision from previous version, includes new analysis and results, matches accepted version in Phys. Rev. D