Nonzero θ13 from the Triangular Ansatz and Leptogenesis
Abstract
Recent experiments indicate a departure from the exact tri-bimaximal mixing by measure ring definitive nonzero value of θ13. Within the framework of type I seesaw mechanism, we reconstruct the triangular Dirac neutrino mass matrix from the μ - τ symmetric mass matrix. The deviation from μ - τ symmetry is then parametrized by adding dimensionless parameters yi in the triangular mass matrix. In this parametrization of the neutrino mass matrix, the nonzero value θ13 is controlled by Δy = y4 - y6. We also calculate the resulting leptogenesis and show that the triangular texture can generate the observed baryon asymmetry in the universe via leptogenesis scenario.
- Publication:
-
Modern Physics Letters A
- Pub Date:
- August 2012
- DOI:
- 10.1142/S0217732312501519
- arXiv:
- arXiv:1207.1967
- Bibcode:
- 2012MPLA...2750151B
- Keywords:
-
- Neutrino physics;
- flavor symmetry;
- leptogenesis;
- matter–antimatter;
- 14.60.Pq;
- 11.30.Hv;
- 98.80.Cq;
- Neutrino mass and mixing;
- Flavor symmetries;
- Particle-theory and field-theory models of the early Universe;
- High Energy Physics - Phenomenology
- E-Print:
- 12 pages, 6 figures, corrected typos