Neutrino democracy and other phenomenology from 5D SO(10)

Shafi, Qaisar; Tavartkiladze, Zurab

doi:10.1016/s0550-3213(03)00489-9

Cited by 13 publications

(3 citation statements)

References 119 publications

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“…The whole Yukawa sector is controlled by the VEVs of few multiplets: H 10 , that breaks the electroweak symmetry, Σ ⊕ Σ, that breaks the PS symmetry down to the SM one and an SO(10) singlet θ, that controls the absolute scale of neutrino masses. Early works based on 5D SO(10) can be found in [27,28]. The authors of [27] combine a traditional U(1) flavour symmetry with the SO (10) GUT formulated in 5D.…”

Section: Discussionmentioning

confidence: 99%

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Fermion masses and proton decay in a minimal five-dimensional SO(10) model

Alciati¹,

Feruglio²,

Lin³

et al. 2006

J. High Energy Phys.

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We propose a minimal SO(10) model in 5 space-time dimensions. The single extra spatial dimension is compactified on the orbifold S 1 /(Z 2 × Z ′ 2 ) reducing the gauge group to that of Pati-Salam SU (4) C × SU (2) L × SU (2) R . The breaking down to the standard model group is obtained through an ordinary Higgs mechanism taking place at the Pati-Salam brane, giving rise to a proper gauge coupling unification. We achieve a correct description of fermion masses and mixing angles by describing first and second generations as bulk fields, and by embedding the third generation into four multiplets located at the Pati-Salam brane. The Yukawa sector is simple and compact and predicts a neutrino spectrum of normal hierarchy type. Concerning proton decay, dimension five operators are absent and the essentially unique localization of matter multiplets implies that the minimal couplings between the super-heavy gauge bosons and matter fields are vanishing. Non-minimal interactions are allowed but the resulting dimension six operators describing proton decay are too suppressed to produce observable effects, even in future, super-massive detectors.

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Section: Discussionmentioning

confidence: 99%

“…Early works based on 5D SO(10) can be found in [27,28]. The authors of [27] combine a traditional U(1) flavour symmetry with the SO (10) GUT formulated in 5D. In this sense, the role of extra dimensions is marginal in order to reproduce their fermion mass pattern.…”

Section: Discussionmentioning

confidence: 99%

Fermion masses and proton decay in a minimal five-dimensional SO(10) model

Alciati¹,

Feruglio²,

Lin³

et al. 2006

J. High Energy Phys.

View full text Add to dashboard Cite

show abstract

“…Moreover, if we introduce extra 10-dimensional matter multiplets and mix or flip the d c and doublet L in the 16 and those in the 10-dimensional matter multiplets by the SO (10) breaking effect, we can explain the fermion masses and mixings by introducing U(1) flavour symmetry [18,19]. This approach can be generalized to the 5-dimensional SO (10) models [20], and to the 6-dimensional SO (10) models where the Yukawa couplings can also be suppressed by the volume suppression factors [21]. However, this approach loses the fermion unification.…”

Section: Introductionmentioning

confidence: 99%

Gauge-Fermion Unification and Flavour Symmetry

Li¹

2004

J. High Energy Phys.

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After we study the 6-dimensional N = (1, 1) supersymmetry breaking and R symmetry breaking on M 4 × T 2 /Z n , we construct two N = (1, 1) supersymmetric E 6 models on M 4 × T 2 /Z 3 where E 6 is broken down to SO(10) × U (1) X by orbifold projection. In Model I, three families of the Standard Model fermions arise from the zero modes of bulk vector multiplet, and the R symmetry U (1) I F × SU (2) 4 − can be considered as flavour symmetry. This may explain why there are three families of fermions in the nature. In Model II, the first two families come from the zero modes of bulk vector multiplet, and the flavour symmetry is similar. In these models, the anomalies can be cancelled, and we have very good fits to the SM fermion masses and mixings. We also comment on the N = (1, 1) supersymmetric E 6 models on M 4 × T 2 /Z 4 and M 4 × T 2 /Z 6 , SU (9) models on M 4 × T 2 /Z 3 , and SU (8) models on T 2 orbifolds.

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Low energy consequences of five-dimensional SO(10)

2004

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We consider five dimensional (5D) supersymmetric SO(10) compactified on the orbifold S 1 /(Z 2 × Z ′ 2 ) such that the SO(10) gauge symmetry is broken on both fixed points (branes), and the residual gauge symmetry isWe explore one example in which the gauge symmetries on the two branes are respectively SU (5) × U (1) X and SU (4) c × SU (2) L × SU (2) R , and the MSSM gauge symmetry is recovered by the usual Higgs mechanism. We discuss how fermion masses and mixings can be understood in this framework by introducing a flavor U (1) F symmetry. Unification of the MSSM gauge couplings and proton stability are also considered. An order of magnitude increase in sensitivity could reveal proton decay.

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Neutrino democracy and other phenomenology from 5D SO(10)

Cited by 13 publications

References 119 publications

Fermion masses and proton decay in a minimal five-dimensional SO(10) model

Fermion masses and proton decay in a minimal five-dimensional SO(10) model

Gauge-Fermion Unification and Flavour Symmetry

Low energy consequences of five-dimensional SO(10)

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