Insensitivity of leptogenesis with flavor effects to low energy leptonic CP violation.
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.
Davidson
Sacha
S
IPN de Lyon, Université Lyon 1, CNRS, 4 rue Enrico Fermi, Villeurbanne, 69622 cedex, France.
Garayoa
Julia
J
Palorini
Federica
F
Rius
Nuria
N