Successful Minimal Leptogenesis in SO(10) models

by Dr Pasquale Di Bari (INFN Padova)

Wednesday 10 Sept 2008, 11:00 → 12:00 Europe/Zurich

1/1-025 (CERN)

I will discuss a long standing issue in leptogenesis, whether it can explain the observed asymmetry starting from a hierarchical neutrino Dirac mass spectrum as suggested by simple SO(10) prescriptions. I will show that this is possible even within the minimal picture of leptogenesis (thermal, type I see-saw mechanism) when the asymmetry production from next-to-lightest RH neutrinos and flavor effects are properly taken into account. The mechanism yields interesting conditions on the low energy neutrino parameters.

References:

• PDB, Nucl.Phys. B727 (2005) 318-354, hep-ph/0502082
• O. Vives, Phys.Rev. D73 (2006) 073006, hep-ph/0512160
• A. Abada et al.,arXiv:0808.2058 [hep-ph]