Neutrino oscillations v.s. leptogenesis in SO(10) models

Nezri, E.; Orloff, J.

doi:10.1088/1126-6708/2003/04/020

Cited by 74 publications

(41 citation statements)

References 50 publications

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“…The tetra-model also yields an SO(10)-like pattern of Dirac and heavy Majorana neutrino masses widely studied in the literature [34][35][36]. However the light physical Majorana neutrino masses are not so hierarchical since the powers of cancel in the see-saw mechanism.…”

Section: Rh Neutrino Masses Are Very Hierarchical)mentioning

confidence: 92%

A model of quark and lepton mixing

King

2014

J. High Energ. Phys.

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We propose a model of quark and lepton mixing based on the tetrahedral A 4 family symmetry with quark-lepton unification via the tetra-colour Pati-Salam gauge group SU(4) P S , together with SU(2) L × U(1) R . The "tetra-model" solves many of the flavour puzzles and remarkably gives ten predictions at leading order, including all six PMNS parameters. The Cabibbo angle is approximately given by θ C ≈ 1/4, due to the tetravacuum alignment (1, 4, 2), providing the Cabibbo connection between quark and lepton mixing. Higher order corrections are responsible for the smaller quark mixing angles and CP violation and provide corrections to the Cabibbo and lepton mixing angles and phases. The tetra-model involves an SO(10)-like pattern of Dirac and heavy right-handed neutrino masses, with the strong up-type quark mass hierarchy cancelling in the see-saw mechanism, leading to a normal hierarchy of neutrino masses with an atmospheric angle in the first octant, θ l 23 = 40 • ± 1 • , a solar angle θ l 12 = 34 • ± 1 • , a reactor angle θ l 13 = 9.0 • ± 0.5 • , depending on the ratio of neutrino masses m 2 /m 3 , and a Dirac CP violating oscillation phase δ l = 260 • ± 5 • .

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Section: Rh Neutrino Masses Are Very Hierarchical)mentioning

confidence: 92%

A model of quark and lepton mixing

King

2014

J. High Energ. Phys.

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“…3 This solution relies on two independent conditions and it is highly non trivial that they can be satisfied simultaneously. The first one, on the model building side, is the SO(10)-inspired condition [25][26][27][28][29], and it corresponds to assume that the Dirac neutrino mass matrix is not too different from the up-quark mass matrix, a typical feature of different grand-unified models such as SO(10) models. 4 The second assumption is dictated 2 As we will discuss in detail, muon-dominated solutions in SO(10)-inspired leptogenesis are found for mi as large as ∼ 1 eV, but these solutions suffer of some fine-tuning, as we will notice, and are certainly less interesting than tauon-dominated solutions representing the bulk of solutions and respecting the upper bound mi O(0.1 eV).…”

Section: Jhep10(2017)029mentioning

confidence: 99%

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

Bari

Fiorentin

2017

J. High Energ. Phys.

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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 V L , 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 V L V CKM , 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 θ 23 41 • to θ 23 44 • , an important effect in the light of the most recent NOνA, T2K and IceCube results.

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“…Quark-lepton symmetry however, renders problematic the implementation of the mechanism of baryogenesis via leptogenesis within the SO(10) see-saw [23,24]. This is due to the two factors of m D in eq.…”

Section: Compact Rh Neutrino Spectrummentioning

confidence: 99%

Squeezing out predictions with leptogenesis from SO(10)

et al. 2012

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We consider the see-saw mechanism within a non-supersymmetric SO(10) model. By assuming the SO(10) quark-lepton symmetry, and after imposing suitable conditions that ensure that the right-handed (RH) neutrino masses are at most mildly hierarchical (compact RH spectrum) we obtain a surprisingly predictive scenario. The absolute neutrino mass scale, the Dirac and the two Majorana phases of the neutrino mixing matrix remain determined in terms of the set of already measured low energy observables, modulo a discrete ambiguity in the signs of two neutrino mixing angles and of the Dirac phase. The RH neutrinos mass spectrum is also predicted, as well as the size and sign of the leptogenesis CP asymmetries. We compute the cosmological baryon asymmetry generated through leptogenesis and obtain the correct sign, and a size compatible with observations.

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Neutrino oscillations v.s. leptogenesis in SO(10) models

Cited by 74 publications

References 50 publications

A model of quark and lepton mixing

A model of quark and lepton mixing

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

Squeezing out predictions with leptogenesis from SO(10)

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