Flavour matters in leptogenesis

Asmaa Abada, Sacha Davidson, Alejandro Ibarra, François Xavier Josse-Michaux, Marta Losada, Antonio Riotto

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number010
JournalJournal of High Energy Physics
Issue number9
StatePublished - Sep 1 2006


  • Beyond Standard Model
  • Neutrino Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Flavour matters in leptogenesis'. Together they form a unique fingerprint.

Cite this