Assuming Majorana neutrinos, we infer from oscillation data the expected values of the parameters mνe and mee probed by β and 0 ν2 β-decay experiments. If neutrinos have a 'normal hierarchy' we get the 90% CL range | mee|=(0.7-4.6) meV, and discuss in which cases future experiments can test this possibility. For 'inverse hierarchy', we get | mee|=(12-57) meV and mνe=(40-57) meV. The 0 ν2 β data imply that almost degenerate neutrinos are lighter than 1.05 h eV at 90% CL ( h∼1 parameterizes nuclear uncertainties), competitive with the β-decay bound. We critically reanalyse the data that were recently used to claim an evidence for 0 ν2 β, and discuss their implications. Finally, we review the predictions of flavour models for mee and θ13.
Nuclear Physics B
- Pub Date:
- August 2002
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- 30 pages, 12 figures. Version 2: footnote at page 21 added. Version 3: updated including SNO NC data. Version 4: addendum about KamLAND data at pages 25,26,27. Version 5: addendum about SNO salt data at pages 28,29,30