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Littlest Seesaw model from S4 x U(1)

Littlest Seesaw model from S4 x U(1)
Littlest Seesaw model from S4 x U(1)
We show how a minimal (littlest) seesaw model involving two right-handed neutrinos and a very constrained Dirac mass matrix, with one texture zero and two independent Dirac masses, may arise from S4 ×U(1) symmetry in a semi-direct supersymmetric model. The resulting CSD3 form of neutrino mass matrix only depends on two real mass parameters plus one undetermined phase. We show how the phase may be fixed to be one of the cube roots of unity by extending the S4 × U(1) symmetry to include a product of Z3 factors together with a CP symmetry, which is spontaneously broken leaving a single residual Z3 in the charged lepton sector and a residual Z2 in the neutrino sector, with suppressed higher order corrections. With the phase chosen from the cube roots of unity to be −2π/3, the model predicts a normal neutrino mass hierarchy with m1 = 0, reactor angle θ13 = 8.7°, solar angle θ12 = 34°, atmospheric angle θ23 = 44°, and CP violating oscillation phase δCP = −93°, depending on the fit of the model to the neutrino masses.
hep-ph
1029-8479
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 (2016) Littlest Seesaw model from S4 x U(1). Journal of High Energy Physics, 09, [023]. (doi:10.1007/JHEP09(2016)023).

Record type: Article

Abstract

We show how a minimal (littlest) seesaw model involving two right-handed neutrinos and a very constrained Dirac mass matrix, with one texture zero and two independent Dirac masses, may arise from S4 ×U(1) symmetry in a semi-direct supersymmetric model. The resulting CSD3 form of neutrino mass matrix only depends on two real mass parameters plus one undetermined phase. We show how the phase may be fixed to be one of the cube roots of unity by extending the S4 × U(1) symmetry to include a product of Z3 factors together with a CP symmetry, which is spontaneously broken leaving a single residual Z3 in the charged lepton sector and a residual Z2 in the neutrino sector, with suppressed higher order corrections. With the phase chosen from the cube roots of unity to be −2π/3, the model predicts a normal neutrino mass hierarchy with m1 = 0, reactor angle θ13 = 8.7°, solar angle θ12 = 34°, atmospheric angle θ23 = 44°, and CP violating oscillation phase δCP = −93°, depending on the fit of the model to the neutrino masses.

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More information

Accepted/In Press date: 30 August 2016
e-pub ahead of print date: 5 September 2016
Additional Information: 23 pages, matches version published in JHEP
Keywords: hep-ph
Organisations: Theory Group

Identifiers

Local EPrints ID: 410383
URI: http://eprints.soton.ac.uk/id/eprint/410383
ISSN: 1029-8479
PURE UUID: b2685b76-8869-4e99-9165-4912ea3be96a

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Date deposited: 07 Jun 2017 16:31
Last modified: 06 Oct 2020 22:20

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