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Journal of High Energy Physics

, 2016:106

First Online: 19 October 2016Received: 26 August 2016Accepted: 14 October 2016 Abstract

We consider a neutrino mass generating model which employs a scalar leptoquark, Δ, and a scalar diquark, S. The new scalars Δ and S carry the standard model SU3c × SU2L × U1Y quantum numbers 3, 1, −1-3 and 6, 1, −2-3, respectively. The neutrino masses are generated at the two-loop level, as in the Zee-Babu model 1, 2, and Δ-S plays the role of the doubly-singly charged scalar in the Zee-Babu model. With a moderate working assumption that the magnitudes of the six Yukawa couplings between S and the down-type quarks are of the same order, strong connections are found between the neutrino masses and the charged lepton flavor violating processes. In particular, we study \ Z\to \overline{l}{l}^{\prime } \, and l→lγ and find that some portions of the parameter space of this model are within the reach of the planned charged lepton flavor violating experiments. Interesting lower bounds are predicted that \ B\leftZ\to \overline{l}{l}^{\prime} ight\gtrsim 1{0}^{-16} - 1{0}^{-14}\left1{0}^{-14} ight \times {\left1\ \mathrm{T}\mathrm{e}\mathrm{V}\ \cdotp {m} S-7{m} {{}^{\Delta}}^2 ight}^2 \ and Bl → l′γ ≳ 10 − 1010 − 10 × 1 TeV · mS-7mΔ for neutrino masses being the normal inverted hierarchical pattern. The type of neutrino mass hierarchy could also be determined by measuring the charged lepton flavor violating double ratios. Moreover, definite leptoquark decay branching ratios are predicted when there is no Yukawa interaction between the right-handed fermions and Δ the branching fraction of Δ to a charged lepton and a quark is 50%, which could help refine the collider search limit on the scalar leptoquark mass.

KeywordsBeyond Standard Model Neutrino Physics ArXiv ePrint: 1608.05511

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Autor: We-Fu Chang - Siao-Cing Liou - Chi-Fong Wong - Fanrong Xu

Fuente: https://link.springer.com/







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