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Vanishing of the CP asymmetry in leptogenesis due to form dominance

Vanishing of the CP asymmetry in leptogenesis due to form dominance
Vanishing of the CP asymmetry in leptogenesis due to form dominance
We emphasize that the vanishing of the CP asymmetry in leptogenesis, previously observed for models with tribimaximal mixing and family symmetry, may be traced to a property of the type I seesaw mechanism satisfied by such models known as form dominance, corresponding to the case of a diagonal Casas-Ibarra R-matrix. Form dominance leads to vanishing flavor-dependent CP asymmetries irrespective of whether one has tribimaximal mixing or a family symmetry. Successful leptogenesis requires violation of form dominance, but not necessarily violation of tribimaximal mixing. This may be achieved in models where the family symmetry responsible for tribimaximal mixing is implemented indirectly and a strong neutrino mass hierarchy is present with the form dominance broken only softly by the right-handed neutrino responsible for the lightest neutrino mass, as in constrained sequential dominance.

2470-0029
33002
Choubey, Sandhya
54352d9a-fbbb-4a18-8a65-1b57ff21207c
King, S.
f8c616b7-0336-4046-a943-700af83a1538
Mitra, Manimala
9c43e0ec-48e6-4612-a16b-24ddd229727f
Choubey, Sandhya
54352d9a-fbbb-4a18-8a65-1b57ff21207c
King, S.
f8c616b7-0336-4046-a943-700af83a1538
Mitra, Manimala
9c43e0ec-48e6-4612-a16b-24ddd229727f

Choubey, Sandhya, King, S. and Mitra, Manimala (2010) Vanishing of the CP asymmetry in leptogenesis due to form dominance. Physical Review D, 82 (3), 33002. (doi:10.1103/PhysRevD.82.033002).

Record type: Article

Abstract

We emphasize that the vanishing of the CP asymmetry in leptogenesis, previously observed for models with tribimaximal mixing and family symmetry, may be traced to a property of the type I seesaw mechanism satisfied by such models known as form dominance, corresponding to the case of a diagonal Casas-Ibarra R-matrix. Form dominance leads to vanishing flavor-dependent CP asymmetries irrespective of whether one has tribimaximal mixing or a family symmetry. Successful leptogenesis requires violation of form dominance, but not necessarily violation of tribimaximal mixing. This may be achieved in models where the family symmetry responsible for tribimaximal mixing is implemented indirectly and a strong neutrino mass hierarchy is present with the form dominance broken only softly by the right-handed neutrino responsible for the lightest neutrino mass, as in constrained sequential dominance.

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Published date: 2010

Identifiers

Local EPrints ID: 179043
URI: http://eprints.soton.ac.uk/id/eprint/179043
ISSN: 2470-0029
PURE UUID: 50ac022f-4fd0-4509-8df6-589828fde292

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Date deposited: 26 Apr 2011 12:49
Last modified: 16 Jul 2019 23:44

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