Flavour matters in leptogenesis

By A. Abada, S. Davidson, A. Ibarra, F. Josse-Michaux, M. Losada, A. Riotto. 2006

396 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/105b8de9cfb21e98b0a3d12a10eccd53c13004d5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

1. E. Nardi
2. Z. Xing
3. C. S. Fong
4. A. Riotto

In Nuclear and High Energy Physics

1. Z. Xing
2. E. Nardi
3. C. S. Fong
4. Sacha Davidson
5. Yosef Nir
6. A. Riotto
7. D. Seery
8. L. Senatore

Citations in the corpus

• Leptogenesis in the Universe (2012, methodology): “As a consequence, the EW and QCD sphaleron equilibrium conditions are modified with respect to the SM, and this yields a different pattern of sphaleron induced lepton-flavour mixing [67, 69, 70].”
• Flavor structures of charged fermions and massive neutrinos (2019, result): “The CP-violating asymmetry between Ni → `α + H and Ni → `α + H decays in the early Universe provides a natural possibility of generating an intriguing lepton-antilepton asymmetry.”
• Leptogenesis (2008, positive): “1, starting from a specific set of parameters within a given seesaw model, the inclusion of flavor effects in the calculation of the baryon asymmetry can change the result by factors of a few to orders of magnitude [47, 48].”