Baryon asymmetry via leptogenesis in a neutrino mass model with complex scaling

Understand

Baryogenesis via leptogenesis is investigated in a specific model of light neutrino masses and mixing angles.

• The latter was proposed on the basis of an assumed complex-extended scaling property of the neutrino Majorana mass matrix $M_\nu$, derived with a type-1 seesaw from a Dirac mass matrix $m_D$ and a heavy singlet neutrino Majorana mass matrix $M_R$.
• One of its important features, highlighted here, is that there is a common source of the origin of a nonzero $\theta_{13}$ and the CP violating lepton asymmetry through the imaginary part of $m_D$.
• The model predicted CP violation to be maximal for the Dirac type and vanishing for the Majorana type.