Neutrino Masses and Lepton-Flavor Violation in Supersymmetric Models with lopsided Froggatt-Nielsen charges

Abstract

We analyze in detail lepton-flavor violation (LFV) in the charged-lepton sector such as $\mu \to e\gamma$, $\tau \to \mu \gamma$, $\mu \to eee$ and the $\mu \to e$ 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 mixings 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.

33 pages, 20 figures

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