title: Insensitivity of leptogenesis with flavor effects to low energy leptonic CP violation.
abstract: If the baryon asymmetry of the Universe is produced by leptogenesis, CP violation is required in the lepton sector. In the seesaw extension of the standard model with three hierarchical right-handed neutrinos, we show that the baryon asymmetry is insensitive to the Pontecorvo-Maki-Nagakawa-Sakata phases: thermal leptogenesis can work for any value of the observable phases. This result was well known when there were no flavor effects in leptogenesis; we show that it remains true when flavor effects are included.
authors.affiliation: IPN de Lyon, Université Lyon 1, CNRS, 4 rue Enrico Fermi, Villeurbanne, 69622 cedex, France.
authors.forename: Sacha
authors.initials: S
authors.lastname: Davidson
authors.forename: Julia
authors.initials: J
authors.lastname: Garayoa
authors.forename: Federica
authors.initials: F
authors.lastname: Palorini
authors.forename: Nuria
authors.initials: N
authors.lastname: Rius