Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-17
Int.J.Mod.Phys.A23:3403-3407,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages. Talk given by Shun Zhou at the 4th International Conference on Flavor Physics, 24-28 September 2007, Beijing (to appe
Scientific paper
10.1142/S0217751X08042201
In this talk, we first give a brief review of the so-called minimal seesaw models and then concentrate on the minimal type-I seesaw model with two almost degenerate right-handed Majorana neutrinos of ${\cal O}(1 {\rm TeV})$. A specific texture of the neutrino Yukawa coupling matrix is proposed to achieve the nearly tri-bimaximal neutrino mixing pattern. This ansatz predicts (1) $\theta^{}_{23} = \pi/4$, $|\delta| = \pi/2$ and $\sin^2 \theta^{}_{12} = (1 - 2 \tan^2 \theta^{}_{13})/3$ in the $m^{}_1 = 0$ case; and (2) $\theta^{}_{23} =\pi/4$ and $\theta^{}_{13} = \delta = 0$ in the $m^{}_3 = 0$ case. In both cases, the cosmological baryon number asymmetry can be explained via the resonant leptogenesis mechanism. Finally, we demonstrate the significance of flavor-dependent effects in our leptogenesis scenario.
Xing Zhi-zhong
Zhou Shun
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