Insensitivity of flavoured leptogenesis to low energy CP violation

Details Insensitivity of flavoured leptogenesis to low energy CP violation Insensitivity of flavoured leptogenesis to low energy CP violation

2007-05-10

arxiv.org/abs/0705.1503v3

Phys.Rev.Lett.99:161801,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure; version accepted for publication, added explanations, notation clarified

Scientific paper

10.1103/PhysRevLett.99.161801

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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