Study of and decays at Belle

Based on a high-statistical data sample of τ-pairs, accumulated with the Belle detector at the KEKB collider, we have carried out precise measurements of and of the basic parameters of the neutral meson as and . The branching fractions of several τ decays involving η meson(s) () is also obtained with much better accuracies than from previous measurements, by carefully scrutinizing background (BG) contaminations. A comparisons are made with some theoretical calculations. (All results presented here are preliminary.) [Copyright &y& Elsevier]