Among the rare tau decays, those with one or more kaons in the final states
are rather difficult to study and identify, due to the huge pion-only decay
background. For this kind of analysis the use of the RICH is unvaluable.
The Genova group contributed to the measurement of the decay ratios of the
two 4-body final states, and .
A new algorithm for particle identification has been conceived, giving a
better efficiency and lower systematic effects.
Plans for the near future:
Look for 3-kaon production in 4-body decays (foreseen but never observed);
Study of resonances and test of phenomenological hadronization models (cfr.
Mirkes et al.);
Study of the 4-body final state containing a kaon and two neutral pions;
Measurement of the upper limit for the tau neutrino mass.