Assuming Majorana neutrinos, we infer from oscillation data the expected values of the parameters mνe and mee probed by β and 0ν2β-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 0ν2β data imply that almost degenerate neutrinos are lighter than 1.05h 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 0ν2β, and discuss their implications. Finally, we review the predictions of flavour models for mee and θ13.
NEUTRINO OSCILLATIONS AND SIGNALS IN BETA AND 0NU2BETA EXPERIMENTS.
FERUGLIO, FERRUCCIO;
2002
Abstract
Assuming Majorana neutrinos, we infer from oscillation data the expected values of the parameters mνe and mee probed by β and 0ν2β-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 0ν2β data imply that almost degenerate neutrinos are lighter than 1.05h 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 0ν2β, and discuss their implications. Finally, we review the predictions of flavour models for mee and θ13.
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