Neutrino Mixing in a Democratic-Seesaw-Mass-Matrix Model
Yoshio Koide
Abstract
On the basis of a seesaw-type mass matrix model for quarks and leptons, Mf mL MF-1 mR, where mL mR are universal for f=u,d,ν and e (up-quark-, down-quark-, neutrino- and charged lepton-sectors), and MF has a form [(unit matrix)+(democratic-type matrix)], neutrino masses and mixings are investigated. It is tried to understand a large νμ-ντ mixing, i.e., 2 2θ23 1, with mν1 mν2 mν3, which has been suggested by the atmospheric neutrino data.
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