Neutrino helicity asymmetries in leptogenesis

Journal Article · Sun May 01 00:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.096001· OSTI ID:20709408

Bento, Luis; Santos, Francisco C ^[1]

---

1. Universidade de Lisboa, Faculdade de Ciencias, Centro de Fisica Nuclear da Universidade de Lisboa, Avenida Prof. Gama Pinto 2, 1649-003 Lisbon (Portugal)

It is pointed out that the heavy singlet neutrinos characteristic of leptogenesis develop asymmetries in the abundances of the two helicity states as a result of the same mechanism that generates asymmetries in the standard lepton sector. Neutrinos and standard leptons interchange asymmetries in collisions with each other. It is shown that an appropriate quantum number, B-L{sup '}, combining baryon, lepton and neutrino asymmetries, is not violated as fast as the standard B-L. This suppresses the washout effects relevant for the derivation of the final baryon asymmetry. One presents detailed calculations for the period of neutrino thermal production in the framework of the singlet seesaw mechanism.

• OSTI ID: 20709408
• Journal Information: Physical Review. D, Particles Fields, Vol. 71, Issue 9; Other Information: DOI: 10.1103/PhysRevD.71.096001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABUNDANCE
ASYMMETRY
BARYONS
HELICITY
NEUTRINO REACTIONS
NEUTRINOS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
SYMMETRY