Neutrino mixing in Seesaw model
Abstract
We study the neutrino mixing matrix (MNS matrix) in seesaw model. Assuming large mass hierarchy for heavy right-handed Majorana mass, we show that MNS matrix is determined by a unitary matrix which transforms neutrino yukawa term into a triangular form. Large mixing may occur even if yukawa matrix for charged lepton and that for neutrino is simultaneously diagonalized by biunitary transformation. It naturally may satisfy the experimental lower bound of the mixing from the atmospheric neutrino oscillation.Keywords
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