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Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis

Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis
Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis

We show that the four high-energy Littlest Seesaw parameters in the flavour basis, namely two real Yukawa couplings plus the two right-handed neutrino masses, can be determined by an excellent fit to the seven currently constrained observables of low-energy neutrino data and leptogenesis. Taking into account renormalisation group corrections, we estimate χ2 ≃ 1.5-2.6 for the three d.o.f., depending on the high-energy scale and the type of non-supersymmetric Littlest Seesaw model. We extract allowed ranges of neutrino parameters from our fit data, including the approximate mu-tau symmetric predictions θ23 = 45° ± 1° and δ = −90° ± 5°, which, together with a normal mass ordering with m1 = 0, will enable Littlest Seesaw models to be tested in future neutrino experiments.

Neutrino Physics, Solar and Atmospheric Neutrinos
1126-6708
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Sedgwick, Susana Molina
6024769e-3664-4279-9149-44a190e10545
Rowley, Samuel J.
ab8cb79d-627e-4e1c-834a-8a16f12fc65a
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Sedgwick, Susana Molina
6024769e-3664-4279-9149-44a190e10545
Rowley, Samuel J.
ab8cb79d-627e-4e1c-834a-8a16f12fc65a

King, Stephen F., Sedgwick, Susana Molina and Rowley, Samuel J. (2018) Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis. Journal of High Energy Physics, 2018 (10), [184]. (doi:10.1007/JHEP10(2018)184).

Record type: Article

Abstract

We show that the four high-energy Littlest Seesaw parameters in the flavour basis, namely two real Yukawa couplings plus the two right-handed neutrino masses, can be determined by an excellent fit to the seven currently constrained observables of low-energy neutrino data and leptogenesis. Taking into account renormalisation group corrections, we estimate χ2 ≃ 1.5-2.6 for the three d.o.f., depending on the high-energy scale and the type of non-supersymmetric Littlest Seesaw model. We extract allowed ranges of neutrino parameters from our fit data, including the approximate mu-tau symmetric predictions θ23 = 45° ± 1° and δ = −90° ± 5°, which, together with a normal mass ordering with m1 = 0, will enable Littlest Seesaw models to be tested in future neutrino experiments.

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Accepted/In Press date: 11 October 2018
e-pub ahead of print date: 29 October 2018
Published date: October 2018
Keywords: Neutrino Physics, Solar and Atmospheric Neutrinos

Identifiers

Local EPrints ID: 426495
URI: http://eprints.soton.ac.uk/id/eprint/426495
ISSN: 1126-6708
PURE UUID: d535a5f9-9f7f-499e-8939-d9b4f76a35a1

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Date deposited: 29 Nov 2018 17:30
Last modified: 16 Dec 2019 17:51

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