Neutrino oscillations and signals in beta and 0nu2beta experiments

  • 1 March 2002
Abstract
Assuming Majorana neutrinos, we infer from oscillation data the expected values of the parameters m_{nu_e} and m_{ee} probed by beta and 0nu2beta-decay experiments. If neutrinos have a `normal hierarchy' we get the 90% CL ranges |m_{ee}| = (0.5 - 5) meV, and discuss in which cases future experiments can test this possibility. For `inverse hierarchy', we get |m_{ee}| = (10 - 57) meV and m_{\nu_e} = (40 - 57) meV. The 0nu2beta data imply that almost degenerate neutrinos are lighter than 0.95 h eV at 90% CL, competitive with the beta-decay bound. We critically reanalyse the data that were recently used to claim an evidence for 0nu2beta, and discuss their implications. Finally, we review the predictions of flavour models for m_{ee} and theta_{13}.

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