Insensitivity of Leptogenesis with Flavor Effects to Low Energy Leptonic CP Violation

Journal Article · Fri Oct 19 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.161801· OSTI ID:21024311

Davidson, Sacha; Palorini, Federica ^[1]; Garayoa, Julia; Rius, Nuria ^[2]

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1. IPN de Lyon, Universite Lyon 1, CNRS, 4 rue Enrico Fermi, Villeurbanne, 69622 cedex (France)
2. Departamento de Fisica Teorica and IFIC, Universidad de Valencia-CSIC, Valencia (Spain)

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.

• OSTI ID: 21024311
• Journal Information: Physical Review Letters, Vol. 99, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.99.161801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYONS
CP INVARIANCE
FLAVOR MODEL
NEUTRINOS
PARTICLE PRODUCTION
STANDARD MODEL
UNIVERSE