Leptogenesis with small violation of B−L

Journal Article · Sun Jul 01 04:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/07/030· OSTI ID:22279845

Racker, J.; Peña, Manuel; Rius, Nuria ^[1]

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1. Depto. de Física Teórica and IFIC, Universidad de Valencia-CSIC, Edificio de Institutos de Paterna, Apt. 22085, 46071 Valencia (Spain)

We analyze leptogenesis in the context of seesaw models with almost conserved lepton number, focusing on the L-conserving contribution to the flavoured CP asymmetries. We find that, contrary to previous claims, successful leptogenesis is feasible for masses of the lightest heavy neutrino as low as M{sub 1} ∼ 10{sup 6} GeV, without resorting to the resonant enhancement of the CP asymmetry for strongly degenerate heavy neutrinos. This lower limit renders thermal leptogenesis compatible with the gravitino bound in supersymmetric scenarios.

• OSTI ID: 22279845
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
ASYMMETRY
COSMOLOGY
CP INVARIANCE
FLAVOR MODEL
GEV RANGE
GRAVITONS
LEPTON NUMBER
NEUTRINOS
PARTICLE PRODUCTION
REST MASS
SUPERSYMMETRY