Enlarging the window for radiative leptogenesis

Details Enlarging the window for radiative leptogenesis Enlarging the window for radiative leptogenesis

2005-07-07

arxiv.org/abs/hep-ph/0507092v2

Phys.Lett. B633 (2006) 336-344

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 2 figures, final version to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.11.070

We investigate the scenario of resonant thermal leptogenesis, in which the leptonic asymmetries are generated through renormalization group corrections induced at the leptogenesis scale. In the framework of the standard model extended by three right-handed heavy Majorana neutrinos with masses M1 = M2 << M3 at some high scale, we show that the mass splitting and CP-violating effects induced by renormalization group corrections can lead to values of the CP asymmetries large enough for a successful leptogenesis. In this scenario, the low-energy neutrino oscillation data can also be easily accommodated. The possibility of having an underlying symmetry behind the degeneracy in the right-handed neutrino mass spectrum is also discussed.

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