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Insensitivity of leptogenesis with flavor effects to low energy leptonic CP violation

AuthorsDavidson, Sacha; Garayoa, Julia ; Palorini, Federica; Rius, Nuria
KeywordsStandard Model
[PACS] Non-standard-model neutrinos, right-handed neutrinos, etc.
[PACS] Global symmetries (e.g., baryon number, lepton number) in particles and fields
[PACS] Neutrino interactions
[PACS] Neutrino mass and mixing
Issue Date18-Oct-2007
PublisherAmerican Physical Society
CitationPhysical Review Letters 99(16): 161801 (2007)
AbstractIf 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.
Description4 pages, 1 figure.-- PACS nrs.: 14.60.St; 11.30.Fs; 13.15.+g; 14.60.Pq.-- ISI Article Identifier: 000250296000016.-- ArXiv pre-print available at: http://arxiv.org/abs/0705.1503
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.99.161801
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