The Tau Lepton

Z -> tau + tau -> hadrons Z -> tau + tau -> mu e nu's


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.

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    For information, feel free to ask Alessandro PETROLINI