| DATE: |
2010-01-29 14:00 - |
| PLACE: |
4 Go-Kan Rm. 345 |
| TITLE: |
None-zero-Ue3 and leptogenesis through spontaneous A4 symmetry breaking |
| CONTACT: |
HASHIMOTO, Michio / michioh AT post.kek.jp |
| SPEAKER: |
Dr. Yang-Hwan Ahn |
| LANGUAGE: |
English |
| ABSTRACT: |
If A4 flavour symmetry is considered, it seems to be extremely attractive because of their predictions of tri-bimaximal mixing (U_{e3}=0, U_{e2}=1/sqrt{2},U_{mu3}=1/sqrt {2}) and naturalness. The recent analysis based on global fits of the available data gives us hints for theta_{13}>0 at 1 sigma, a relatively large Ue3, even which is not yet a significant indication for a non-zero theta_{13}. In addition to this, even higher order terms are considered, at a very large scale (around 10^{13}-10^{14} GeV) the BAU is successfully explained, A4 symmetry (with hierarchical heavy Majorana neutrino mass pattern) itself could not explain the Baryon asymmetry of the Universe in a Lagrangian level. We address the possibility of a link between TeV-leptogenesis and a relatively large Ue3 through spontaneous symmetry breaking of A4 in a radiative seesaw mechanism. |
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