Non-diagonal Charged Lepton Yukawa Matrix: Effects on Neutrino Mixing in   Supersymmetry
  Generally the diagonalization of the mass matrix of the charged leptons is a part of the neutrino UPMNS matrix. However, usually this contribution is ignored by assuming a diagonal mass matrix for charged leptons. In this letter we test this common assumption in the context of neutrino physics. Our analytical and numerical results for two supersymmetric models reveal that such a simplification is not justified. Especially for the solar and reactor mixing angles important modifications are found. 
Giovanna Cottin, Marco Aurelio Diaz, and Benjamin Koch
hep-ph