Modulo C-XI, 2nd floor
Facultad de Ciencias UAM
CU Cantoblanco, 28049-Madrid

18-20 May, 2005

The Last Chance for Leptogenesis: Electroweak Baryogenesis
Hitoshi Murayama
UC, Berkeley

The leptogenesis is a very attractive mechanism of baryogensis, especially after the discovery of neutrino oscillations. However, it suffers from several drawbacks. One is that it is in tension with many solutions to the hierarchy probolem, e.g., the gravitino problem in supersymmetry, or lack of our understanding of cosmology above TeV scale with extra dimensions. The other is that it is not really testable experimentally. Both of the problems can be solved if the leptogenesis takes place at as low scale as possible. I discuss that the electroweak phase transition is a natural place for leptogenesis, because the leptonic Jarlskog invariant can be order unity thanks to the anarchic structure of neutrino masses and mixings unlike in the quark sector where J is 10^-20.

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