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Journal Articles Journal of High Energy Physics Year : 2006

Flavour Matters in Leptogenesis

A. Abada
  • Function : Author
Sacha Davidson
A. Ibarra
  • Function : Author
F. -X. Josse-Michaux
  • Function : Author
M. Losada
  • Function : Author
A. Riotto
  • Function : Author


We give analytic approximations to the baryon asymmetry produced by thermal leptogenesis with hierarchical right-handed neutrinos. Our calculation includes flavour-dependent washout processes and CP violation in scattering, and neglects gauge interactions and finite temperature corrections. Our approximate formulae depend upon the three CP asymmetries in the individual lepton flavours as well as on three flavour-dependent efficiency factors. We show that the commonly used expressions for the lepton asymmetry, which depend on the total CP asymmetry and one single efficiency factor, may fail to reproduce the correct lepton asymmetry in a number of cases. We illustrate the importance of using the flavour-dependent formulae in the context of a two right-handed neutrino model.

Dates and versions

in2p3-00077728 , version 1 (01-06-2006)



A. Abada, Sacha Davidson, A. Ibarra, F. -X. Josse-Michaux, M. Losada, et al.. Flavour Matters in Leptogenesis. Journal of High Energy Physics, 2006, 09, pp.010. ⟨10.1088/1126-6708/2006/09/010⟩. ⟨in2p3-00077728⟩
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