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Insensitivity of flavoured leptogenesis to low energy 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 PMNS phases: thermal leptogenesis can work for any value of the observable phases. This result was well-known when there are no flavour effects in leptogenesis; we show that it remains true when flavour effects are included.
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http://hal.in2p3.fr/in2p3-00190979
Contributor : Dominique Girod <>
Submitted on : Friday, November 23, 2007 - 2:00:54 PM
Last modification on : Saturday, June 13, 2020 - 6:30:02 PM

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S. Davidson, J. Garayoa, F. Palorini, N. Rius. Insensitivity of flavoured leptogenesis to low energy CP violation. Physical Review Letters, American Physical Society, 2007, 99, pp.161801. ⟨10.1103/PhysRevLett.99.161801⟩. ⟨in2p3-00190979⟩

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