Neutrino mass spectrum from the results of neutrino oscillation experiments
Joint Institute for Nuclear Research, Dubna, Russia
2 INFN, Sezione di Torino, and Dipartimento di Fisica Teorica, Università di Torino, Via P. Giuria 1, I-10125, Torino, Italy
3 Institute for Theoretical Physics, University of Vienna, Boltzmanngasse 5, A-1090, Vienna, Austria
Revised: 17 March 1997
Published online: 27 February 2005
All the possible schemes of neutrino mixing with four massive neutrinos inspired by the existing experimental indications in favor of neutrino mixing are considered in a model independent way. Assuming that in short-baseline experiments only one mass-squared difference is relevant, it is shown that the scheme with a neutrino mass hierarchy is not compatible with the experimental results. Only two schemes with two pairs of neutrinos with close masses separated by a mass difference of the order of 1 eV are in agreement with the results of all experiments. One of these schemes leads to possibly observable effects in3H and (β,β)oν experiments.
© Springer-Verlag, 1998