منابع مشابه
A see-saw model of sterile neutrino
If the smallness of the mass of the sterile neutrino is to be explained by seesaw mechanism, the off-diagonal entries of its mass matrix has to be protected by some symmetry near the electroweak scale. We study a gauge model based on SU(2)qL × SU(2) l L × U(1) q Y × U(1) l Y un-unified gauge group which breaks to SU(2)L × U(1)Y at the TeV region and this serves our purpose. The diagonal element...
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The LFV charged lepton decays µ → e+γ, τ → e+γ and τ → µ+γ and thermal leptogenesis are analysed in the MSSM with seesaw mechanism of neutrino mass generation and soft SUSY breaking with universal boundary conditions. The case of hierarchical heavy Majorana neutrino mass spectrum, M 1 ≪ M 2 ≪ M 3 , is investigated. Leptogenesis requires M 1 > ∼ 10 9 GeV. Considering the natural range of values ...
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We systematically analyze quantum corrections in see-saw scenarios, including effects from above as well as below the see-saw scales. We derive approximate renormalization group equations for neutrino masses, lepton mixings and CP phases, yielding an analytic understanding and a simple estimate of the size of the effects. Even for hierarchical masses, they often exceed the precision of future e...
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We consider the running of the neutrino mass matrix in the Standard Model and the Minimal Supersymmetric Standard Model, extended by heavy singlet Majorana neutrinos. Unlike previous studies, we do not assume that all of the heavy mass eigenvalues are degenerate. This leads to various effective theories when the heavy degrees of freedom are integrated out successively. We calculate the Renormal...
متن کاملSee-saw Mechanisms for Dirac and Majorana Neutrino Masses
(Dated: April 9, 2008) We investigate the see-saw mechanism for generally non-fine-tuned n × n mass matrices involving both Dirac and Majorana neutrinos. We specifically show that the number of naturally light neutrinos cannot exceed half of the dimension of the considered mass matrix. Furthermore, we determine a criterion for mass matrix textures leading to light Dirac neutrinos with the see-s...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(01)00912-1