Off-diagonal structure of neutrino mass matrix in see-saw mechanism and electron-muon-tau lepton universality
Abstract
By a simple extension of the standard model in which (e-μ -τ ) universality is not conserved, we present a scenario within the framework of see-saw mechanism in which the neutrino mass matrix is strictly off-diagonal in the flavor basis. We show that a version of this scenario can accomodate the atmospheric μ -τ neutrino oscillations and μ -e oscillations claimed by the LSND collaboration. PACS: 14.60.Pq; 14.60.St;13.15.+g
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