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A full analytic solution of SO(10)-inspired leptogenesis

A full analytic solution of SO(10)-inspired leptogenesis
A full analytic solution of SO(10)-inspired leptogenesis
Recent encouraging experimental results on neutrino mixing parameters prompt further investigation on SO(10)-inspired leptogenesis and on the associated strong thermal solution that has correctly predicted a non-vanishing reactor mixing angle, it further predicts sin δ ≲ 0, now supported by recent results at ∼ 95% C.L., normally ordered neutrino masses and atmospheric mixing angle in the first octant, best fit results in latest global analyses. Extending a recent analytical procedure, we account for the mismatch between the Yukawa basis and the weak basis, that in SO(10)-inspired models is described by a CKM-like unitary transformation VL, obtaining a full analytical solution that provides useful insight and reproduces accurately all numerical results, paving the way for future inclusion of different sources of theoretical uncertainties and for a statistical analysis of the constraints. We show how muon-dominated solutions appear for large values of the lightest neutrino mass in the range (0.01–1) eV but also how they necessarily require a mild fine tuning in the seesaw relation. For the dominant (and untuned) tauon-dominated solutions we show analytically how, turning on VL ≃ VCKM, some of the constraints on the low energy neutrino parameters get significantly relaxed. In particular we show how the upper bound on the atmospheric neutrino mixing angle in the strong thermal solution gets relaxed from θ23 ≲ 41° to θ23 ≲ 44°, an important effect in the light of the most recent NOνA, T2K and IceCube results.
1029-8479
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Re Fiorentin, Michele
7ae3ffa8-91d7-4d80-b483-26ade83df5fd
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Re Fiorentin, Michele
7ae3ffa8-91d7-4d80-b483-26ade83df5fd

Di Bari, Pasquale and Re Fiorentin, Michele (2017) A full analytic solution of SO(10)-inspired leptogenesis. Journal of High Energy Physics, 1710 (029). (doi:10.1007/JHEP10(2017)029).

Record type: Article

Abstract

Recent encouraging experimental results on neutrino mixing parameters prompt further investigation on SO(10)-inspired leptogenesis and on the associated strong thermal solution that has correctly predicted a non-vanishing reactor mixing angle, it further predicts sin δ ≲ 0, now supported by recent results at ∼ 95% C.L., normally ordered neutrino masses and atmospheric mixing angle in the first octant, best fit results in latest global analyses. Extending a recent analytical procedure, we account for the mismatch between the Yukawa basis and the weak basis, that in SO(10)-inspired models is described by a CKM-like unitary transformation VL, obtaining a full analytical solution that provides useful insight and reproduces accurately all numerical results, paving the way for future inclusion of different sources of theoretical uncertainties and for a statistical analysis of the constraints. We show how muon-dominated solutions appear for large values of the lightest neutrino mass in the range (0.01–1) eV but also how they necessarily require a mild fine tuning in the seesaw relation. For the dominant (and untuned) tauon-dominated solutions we show analytically how, turning on VL ≃ VCKM, some of the constraints on the low energy neutrino parameters get significantly relaxed. In particular we show how the upper bound on the atmospheric neutrino mixing angle in the strong thermal solution gets relaxed from θ23 ≲ 41° to θ23 ≲ 44°, an important effect in the light of the most recent NOνA, T2K and IceCube results.

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10.1007_JHEP10(2017)029 - Version of Record
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Accepted/In Press date: 7 September 2017
e-pub ahead of print date: 4 October 2017

Identifiers

Local EPrints ID: 415496
URI: http://eprints.soton.ac.uk/id/eprint/415496
ISSN: 1029-8479
PURE UUID: cc832485-a815-46e6-adaa-44d6c45a741b

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Date deposited: 13 Nov 2017 17:30
Last modified: 21 Nov 2021 09:20

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Author: Michele Re Fiorentin

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