Short-baseline neutrino oscillations and neutrinoless double-beta decay in the framework of three neutrino mixing and a mass hierarchy

Details Short-baseline neutrino oscillations and neutrinoless double-beta decay in the framework of three neutrino mixing and a mass hierarchy Short-baseline neutrino oscillations and neutrinoless double-beta decay in the framework of three neutrino mixing and a mass hierarchy

1996-02-02

arxiv.org/abs/hep-ph/9602216v1

Phys.Rev.D54:1881-1890,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX file, 26 pages including 9 figures. The postscript file is available at http://www.to.infn.it/teorici/giunti/papers.htm

Scientific paper

10.1103/PhysRevD.54.1881

We have analyzed the results of the latest terrestrial neutrino oscillation experiments in the framework of a model with mixing of three massive neutrinos and a neutrino mass hierarchy ($ m_1 << m_2 << m_3 $). In this model, oscillations of the terrestrial neutrinos are characterized by three parameters, $ \Delta m^2 = m_3^2 - m_1^2 $ and the squared moduli of the two mixing matrix elements $U_{e3}$ and $U_{\mu3}$. Using the results of disappearance experiments and solar neutrino experiments, it is shown that only two regions of possible values of $|U_{e3}|^2$ and $|U_{\mu3}|^2$ are allowed: I. $|U_{e3}|^2$ and $|U_{\mu3}|^2$ are both small and II. $|U_{e3}|^2$ is small and $|U_{\mu3}|^2$ is large. If the mixing parameters are in the region I, $ \nu_\mu <-> \nu_e $ oscillations are suppressed. In this case the LSND indication in favor of $ \nu_\mu <-> \nu_e $ oscillations is not compatible with the negative results of all other experiments. If the mixing parameters are in the region II, $ \nu_e <-> \nu_\tau $ oscillations are strongly suppressed. If massive neutrinos are Majorana particles, our analysis shows that neutrinoless double-beta decay could be observed in the experiments of the next generation only if the mixing parameters are in the region I.

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