Sm. Bilenky et al., NEUTRINO MASS-SPECTRUM FROM THE RESULTS OF NEUTRINO OSCILLATION EXPERIMENTS, EUROPEAN PHYSICAL JOURNAL C-PARTICLES AND FIELDS, 1(1-2), 1998, pp. 247-253
All the possible schemes of neutrino mixing with four massive neutrino
s inspired by the existing experimental indications in favor of neutri
no mixing are considered in a model independent way. Assuming that in
short-baseline experiments only one mass-squared difference is relevan
t, it is shown that the scheme with a neutrino mass hierarchy is not c
ompatible with the experimental results. Only two schemes with two pai
rs of neutrinos with close masses separated by a mass difference of th
e order of 1 eV are in agreement with the results of all experiments.
One of these schemes leads to possibly observable effects in H-3 and (
beta beta)(0V) experiments.