Following recent results from the SNO solar neutrino experiment and the K2K long-baseline neutrino experiment, the combined existing data on neutrino oscillations now point strongly to a specific form for the lepton mixing matrix, with effective bimaximal mixing of ν µ and ν τ at the atmospheric scale and effective trimaximal mixing for ν e with ν µ and ν τ at the solar scale (hence 'tri-bimaximal' mixing). We give simple mass-matrices leading to tri-bimaximal mixing, and discuss its relation to the Fritzsch-Xing democratic ansatz.

No abstract

No abstract

No abstract

No abstract