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On the origin of neutrino flavour symmetry

On the origin of neutrino flavour symmetry
On the origin of neutrino flavour symmetry
We study classes of models which are based on some discrete family symmetry which is completely broken such that the observed neutrino flavour symmetry emerges indirectly as an accidental symmetry. For such "indirect" models we discuss the D-term flavon vacuum alignments which are required for such an accidental flavour symmetry consistent with tri-bimaximal lepton mixing to emerge. We identify large classes of suitable discrete family symmetries, namely the Δ(3n2) and Δ(6n2) groups, together with other examples such as Z7 x Z3. In such indirect models the implementation of the type I see-saw mechanism is straightforward using constrained sequential dominance. However the accidental neutrino flavour symmetry may be easily violated, for example leading to a large reactor angle, while maintaining accurately the tri-bimaximal solar and atmospheric predictions.
beyond standard model, discrete and finite symmetriesneutrino physics
93
King, Stephen F
f8c616b7-0336-4046-a943-700af83a1538
Luhn, Christoph
59a723a0-9d34-48e8-9b97-9d608ad196c8
King, Stephen F
f8c616b7-0336-4046-a943-700af83a1538
Luhn, Christoph
59a723a0-9d34-48e8-9b97-9d608ad196c8

King, Stephen F and Luhn, Christoph (2009) On the origin of neutrino flavour symmetry. Journal of High Energy Physics, 2009 (JHEP10), 93. (doi:10.1088/1126-6708/2009/10/093).

Record type: Article

Abstract

We study classes of models which are based on some discrete family symmetry which is completely broken such that the observed neutrino flavour symmetry emerges indirectly as an accidental symmetry. For such "indirect" models we discuss the D-term flavon vacuum alignments which are required for such an accidental flavour symmetry consistent with tri-bimaximal lepton mixing to emerge. We identify large classes of suitable discrete family symmetries, namely the Δ(3n2) and Δ(6n2) groups, together with other examples such as Z7 x Z3. In such indirect models the implementation of the type I see-saw mechanism is straightforward using constrained sequential dominance. However the accidental neutrino flavour symmetry may be easily violated, for example leading to a large reactor angle, while maintaining accurately the tri-bimaximal solar and atmospheric predictions.

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More information

Published date: October 2009
Keywords: beyond standard model, discrete and finite symmetriesneutrino physics
Organisations: High Energy Physics

Identifiers

Local EPrints ID: 144123
URI: http://eprints.soton.ac.uk/id/eprint/144123
PURE UUID: 64bbe164-7de4-485c-8607-af1d0860c06b

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Date deposited: 26 Apr 2011 13:05
Last modified: 14 Sep 2020 16:34

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