Large lepton mixing in a coset-space family unification on E7/SU(5)×U(1)3

We analyze in detail lepton-flavor violation ͑LFV͒ in the charged-lepton sector such as →e␥, → ␥, →eee, and →e conversion in nuclei, within the framework of supersymmetric models with lopsided Froggatt-Nielsen charges, in which the large mixing in the neutrino sector as well as small mixing in the quark sector can be naturally accommodated. We show that the present experimental limits on the LFV processes already exclude some of the models. The future proposed search for LFV, especially in muon processes, can provide a significant probe to this framework. We also stress the importance of the measurement of U e3 MNS in neutrino experiments, and the fact that the KamLAND experiment could play a significant role to test a certain class of models.

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“…In the present models, these ratios are quite predictive since 2 The tan ␤ dependence of the branching ratios is approximately tan 2 ␤. 1,2,0).…”

Section: Case 2 ä1mentioning

confidence: 58%

Neutrino masses and lepton-flavor violation in supersymmetric models with lopsided Froggatt-Nielsen charges

Sato

Tobe

2001

Phys. Rev. D

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“…Here we see that z = 0 corresponds to an "anarchical" MNS matrix [18,19], whereas z = 1 corresponds to a "semi-anarchical" MNS matrix [20]. The minimalist approach is to add only two righthanded neutrinos.…”

Section: Froggatt-nielsen Frameworkmentioning

confidence: 92%

Probing the Planck scale with proton decay

Harnik¹,

Larson²,

Murayama³

et al. 2005

Nuclear Physics B

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We advocate the idea that proton decay may probe physics at the Planck scale instead of the GUT scale. This is possible because supersymmetric theories have dimension-5 operators that can induce proton decay at dangerous rates, even with R-parity conservation. These operators are expected to be suppressed by the same physics that explains the fermion masses and mixings. We present a thorough analysis of nucleon partial lifetimes in models with a string-inspired anomalous U (1)X family symmetry which is responsible for the fermionic mass spectrum as well as forbidding R-parity violating interactions. Protons and neutrons can decay via R-parity conserving non-renormalizable superpotential terms that are suppressed by the Planck scale and powers of the Cabibbo angle. Many of the models naturally lead to nucleon decay near present limits without any reference to grand unification.

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“…Thus it is the fact that the unification of SU(5) × U(1) into SO(10) occurs only in higher dimensions that allows the missing partner mechanism to be implemented. Recently it has been found that realistic and simple models of quark and lepton masses can be constructed using so-called "lopsided" mass matrices [22,23,24,25]. The essential feature of such models is that the mass matrices of the down quarks and charged leptons are highly asymmetric and that M L ∼ M T D .…”

Section: An So(10) Model In Five Dimensionsmentioning

confidence: 99%

Unifying flippedSU(5)in five dimensions

Barr¹,

Doršner²

2002

Phys. Rev. D

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It is shown that embedding a four-dimensional flipped SU (5) model in a five-dimensional SO (10) model, preserves the best features of both flipped SU (5) and SO(10). The missing partner mechanism, which naturally achieves both doublet-triplet splitting and suppression of d = 5 proton decay operators, is realized as in flipped SU (5), while the gauge couplings are unified as in SO(10). The masses of down quarks and charged leptons, which are independent in flipped SU (5), are related by the SO(10). Distinctive patterns of quark and lepton masses can result. The gaugino mass M 1 is independent of M 3 and M 2 , which are predicted to be equal.

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Large lepton mixing in a coset-space family unification on E7/SU(5)×U(1)3

Cited by 150 publications

References 18 publications

Neutrino masses and lepton-flavor violation in supersymmetric models with lopsided Froggatt-Nielsen charges

Neutrino masses and lepton-flavor violation in supersymmetric models with lopsided Froggatt-Nielsen charges

Probing the Planck scale with proton decay

Unifying flippedSU(5)in five dimensions

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