Tri-bimaximal Neutrino Mixing and Flavor-dependent Resonant Leptogenesis
| dc.creator | Xing, Zhi-zhong | |
| dc.creator | Zhou, Shun | |
| dc.date | 2006-07-27 | |
| dc.date | 2007-08-07 | |
| dc.date.accessioned | 2026-07-07T11:58:49Z | |
| dc.date.available | 2026-07-07T11:58:49Z | |
| dc.description | We propose a particularly economical neutrino mass model, in which there are only two right-handed Majorana neutrinos of ${\cal O}(1)$ TeV and their masses are highly degenerate. Its novel Yukawa-coupling texture together with the seesaw mechanism allows us to achieve the normal neutrino mass hierarchy with $m^{}_1 = 0$ and a nearly tri-bimaximal neutrino mixing pattern with the maximal CP-violating phase: $θ^{}_{23} = π/4$, $|δ| = π/2$ and $\sin^2 θ^{}_{12} = (1 - 2 \tan^2 θ^{}_{13})/3$. One may also obtain the inverted neutrino mass hierarchy with $m^{}_3 = 0$ and the corresponding neutrino mixing pattern with $θ^{}_{23} =π/4$ and $θ^{}_{13} = δ= 0$. In both cases, it is possible to interpret the cosmological baryon number asymmetry $η^{}_{\rm B} \approx 6.1 \times 10^{-10}$ through the resonant leptogenesis mechanism. We demonstrate the significance of flavor-dependent effects in this leptogenesis scenario: they can either flip the sign of the flavor-independent prediction for $η^{}_{\rm B}$ in the $m^{}_1 = 0$ case or magnify the magnitude of the flavor-independent prediction for $η^{}_{\rm B}$ about 50 times in the $m^{}_3 = 0$ case. | |
| dc.description | REVTeX4 18 pages (including 1 PS figure). Title and Abstract changed; flavor effects in leptogenesis recalculated, new results obtained and discussions extended; A comparison between different formulas of CP asymmetries in resonant leptogenesis performed; references updated. Accepted for publication in PLB | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0607302 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0607302 | |
| dc.identifier | Phys.Lett.B653:278-287,2007 | |
| dc.identifier | doi:10.1016/j.physletb.2007.08.009 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206355 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Tri-bimaximal Neutrino Mixing and Flavor-dependent Resonant Leptogenesis | |
| dc.type | text |