Almost maximally broken permutation symmetry for neutrino mass matrix

Assuming three light neutrinos are Majorana particles, we propose mass matrix ansatz for the charged leptons and Majorana neutrinos with family symmetry S₃ broken into S₁ and S₂, respectively. Each matrix has three parameters, which are fixed by measured charged lepton masses, differences of squared neutrino masses relevant to the solar and the atmospheric neutrino puzzles, and the masses of three light Majorana neutrinos as a candidate for hot dark matter with ∑|m_v| ∼ 6 eV. The resulting neutrino mixing is compatible with the data for the current upper limit, 〈mi_v〉_th < 0.7 eV, of neutrino-less double beta decay experiments, and the current data for various types of neutrino oscillation experiments. One solution of our model predicts that υ_μ → υ_τ oscillation probability is about < 0.008 with Δm² ∼ 10^-2 eV², which may not be accessible at CHORUS and other on-going experiments.