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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King, S.F., Sedgwick, S.M. & Rowley, S.J. Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis. J. High Energ. Phys. 2018, 184 (2018). https://doi.org/10.1007/JHEP10(2018)184
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DOI: https://doi.org/10.1007/JHEP10(2018)184