Article (Scientific journals)
Variations on leptogenesis
Aristizabal Sierra, Diego; Losada, Marta; Enrico, Nardi
2008In Physics Letters B, 659, p. 328-335
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Keywords :
Decays of heavy neutrinos; Right-handed neutrinos; Flavor symmetries
Abstract :
[en] We study variations of the standard leptogenesis scenario that can arise if an additional mass scale related to the breaking of some new symmetry (as for example a flavor or the B–L symmetry) is present below the mass MN1 of the lightest right-handed Majorana neutrino. Our scheme is inspired by U(1) models of flavor à la Froggatt–Nielsen, and involves new vectorlike heavy fields F. We show that depending on the specific hierarchy between MN1 and the mass scale of the fields F, qualitatively different realizations of leptogenesis can emerge. We compute the CP asymmetries in N1 decays in all the relevant cases, and we conclude that in most situations leptogenesis could be viable at scales much lower than in the standard scenario.
Disciplines :
Physics
Author, co-author :
Aristizabal Sierra, Diego ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules
Losada, Marta
Enrico, Nardi
Language :
English
Title :
Variations on leptogenesis
Publication date :
January 2008
Journal title :
Physics Letters B
ISSN :
0370-2693
eISSN :
1873-2445
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
659
Pages :
328-335
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 January 2014

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