Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-28
Physics
High Energy Physics
High Energy Physics - Phenomenology
RevTex, 10 pages, title changed, substantial changes. To appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(98)01226-X
We suggest mass matrices for neutrinos and charged leptons that can explain solar and atmospheric neutrino data. The resulting flavor mixing matrix $V_{\nu}$ has a property that $(V_{\nu})_{13}=0$, thus making $\nu_e \leftrightarrow \nu_{\mu}$ and $\nu_{\mu} \leftrightarrow \nu_{\tau}$ oscillations to be effectively a two-channel problem. Phenomenological consequences of the lepton mass matrix ansatze are consistent with the current data on various type of neutrino oscillation experiments except the LSND measurement. %and that three neutrinos are almost degenerate in mass. Three neutrinos, being almost degenerate with $\sum | m_{\nu_i} | \lesssim 1 $ eV, can be a part of hot dark matter without any conflict with the constraint from neutrinoless double beta decay experiments. The $\nu_{\mu} \leftrightarrow \nu_{\tau}$ oscillation, $\sin^2{2\theta_{\mu \tau}}$, is predicted to be 0.86-0.97 with $\Delta m^2_{\mu \tau}\simeq 2 \times 10^{-3} {eV}^2$, which is consistent with the atmospheric neutrino data and can be tested further at the planned MINOS and K2K experiments searching for $\nu_{\mu} \to \nu_{\tau}$ oscillation.
Kang Kyungsik
Kang Sin Kyu
Kim Jihn E.
Ko Pyungwon
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