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Advances in High Energy Physics
Volume 2007, Article ID 39676, 17 pages
Research Article

Predictions for μeγ in Supersymmetry from Nontrivial Quark-Lepton Complementarity and Flavor Symmetry

1INFN-Lecce, Dipartimento di Fisica, Università di Lecce, Via Arnesano, ex Collegio Fiorini, Lecce 73100, Italy
2Centro de Física Téorica de Particulas (CFTP), Departamento de Física, Instituto Superior Técnico, Avenida Rovisco Pais, Lisboa 1049-001, Portugal

Received 19 July 2007; Revised 18 October 2007; Accepted 31 October 2007

Academic Editor: Joseph Formaggio

Copyright © 2007 Marco Picariello. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We compute the effect of nondiagonal neutrino mass in liljγ in Supersymmetry (SUSY) theories with nontrivial quark-lepton complementarity and a flavor symmetry. The correlation matrix VM = UCKMUPMNS is such that its (1,3) entry, as preferred by the present experimental data, is zero. We do not assume that VM is bimaximal. Quark-lepton complementarity and the flavor symmetry strongly constrain the theory and we obtain a clear prediction for the contribution to μeγ and the τ decays τeγ and τμγ. If the Dirac neutrino Yukawa couplings are degenerate but the low-energy neutrino masses are not degenerate, then the lepton decays are related among them by the VM entries. On the other hand, if the Dirac neutrino Yukawa couplings are hierarchical or the low-energy neutrino masses are degenerate, then the prediction for the lepton decays comes from the UCKM hierarchy.