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Leptogenesis with single right-handed neutrino dominance

Leptogenesis with single right-handed neutrino dominance
Leptogenesis with single right-handed neutrino dominance
We make an analytic and numerical study of leptogenesis in the framework of the (supersymmetric) standard model plus the seesaw mechanism with a U(1) family symmetry and single right-handed neutrino dominance. In presenting our analytic and numerical results we make a clear distinction between the theoretically clean asymmetry parameter ?1 and the baryon asymmetry YB. In calculating YB we propose and use a fit to the solutions to the Boltzmann equations which gives substantially more reliable results than parametrizations previously used in the literature. Our results show that there is a decoupling between the low energy neutrino observables and the leptogenesis predictions, but that nevertheless leptogenesis is capable of resolving ambiguities within classes of models which would otherwise lead to similar neutrino observables. For example we show that models where the dominant right-handed neutrino is the heaviest are preferred to models where it is the lightest and study an explicit example of a unified model of this type.
1550-7998
113005-[18pp]
Hirsch, M.
c2099166-8726-47f2-9fed-631278642cd8
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Hirsch, M.
c2099166-8726-47f2-9fed-631278642cd8
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538

Hirsch, M. and King, S.F. (2001) Leptogenesis with single right-handed neutrino dominance. Physical Review D, 64 (11), 113005-[18pp]. (doi:10.1103/PhysRevD.64.113005).

Record type: Article

Abstract

We make an analytic and numerical study of leptogenesis in the framework of the (supersymmetric) standard model plus the seesaw mechanism with a U(1) family symmetry and single right-handed neutrino dominance. In presenting our analytic and numerical results we make a clear distinction between the theoretically clean asymmetry parameter ?1 and the baryon asymmetry YB. In calculating YB we propose and use a fit to the solutions to the Boltzmann equations which gives substantially more reliable results than parametrizations previously used in the literature. Our results show that there is a decoupling between the low energy neutrino observables and the leptogenesis predictions, but that nevertheless leptogenesis is capable of resolving ambiguities within classes of models which would otherwise lead to similar neutrino observables. For example we show that models where the dominant right-handed neutrino is the heaviest are preferred to models where it is the lightest and study an explicit example of a unified model of this type.

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More information

Submitted date: 4 July 2001
Published date: 5 November 2001

Identifiers

Local EPrints ID: 57305
URI: http://eprints.soton.ac.uk/id/eprint/57305
ISSN: 1550-7998
PURE UUID: eb07d78f-fb6a-4fe4-8b80-ee934276bdd8

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Date deposited: 14 Aug 2008
Last modified: 13 Mar 2019 20:34

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Contributors

Author: M. Hirsch
Author: S.F. King

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