Inferred 4.4 eV upper limits on the muon- and tau-neutrino masses

By combining experimental constraints from atmospheric and solar neutrino oscillations and the tritium beta decay endpoint, we infer upper limits of 4.4 eV on the νμ and ντ masses, if the universe consists of three neutrinos. For hierarchical mass spectra m3≫m1,m2 or m3≃m2≫m1 we infer that mνα≲0.08 eV for α=e,μ,τ. In a four neutrino universe, and assuming neutrino oscillations also account for the LSND experimental results, mνα ≲ 5.4 eV. We also obtain lower limits on the masses.