Analysis of tau- -> K_S pi- nu decay at Belle

This seminar is devoted to the study of tau- -> K_S pi- nu
decay with large statistics of about 351/fb collected by Belle.
I'd like to discuss following items:

* Motivation of the study of tau decays into the hadronic system with strangeness.
  Why should we study this particular Ks pi nu decay mode first?

* Event selection strategy. Detection efficiency and corrections.

* The main sources of background, strategies to deal with it.

* Calculation of the branching fraction. Systematic uncertainties, weak points.
  Comparison with the other experiments.

* Study of the KS pi invariant mass spectrum:

  - KS pi mass spectra of the background processes. What are the problems?
  - Taking into account the detector apparatus function.
  - Theoretical description of the mass spectrum. Different parametrizations of the scalar
    and vector formfactors.
  - Precise measurement of the K* meson mass and width.

Some other studies with tau -> Ks pi nu sample, which will be done in the nearest future are briefly discussed.