Study of τ Decays to Six Pions and Neutrino

الأصل · EN

The τ decays to six-pion final states have been studied with the CLEO detector at the Cornell Electron Storage Ring. The measured branching fractions are B(τ-→ 2π-π+3π⁰ντ)=(2.2 ± 0.3 ± 0.4)× 10⁻⁴ and B(τ-→ 3π-2π+π⁰ντ)=(1.7 ± 0.2 ± 0.2)× 10⁻⁴. A search for substructure in these decays shows that they are saturated by intermediate states with η or ω mesons. We present the first observation of the decay τ-→ 2π-π+ωντ and the branching fraction is measured to be (1.2 ± 0.2 ± 0.1) × 10⁻⁴. The measured branching fractions are in good agreement with the isospin expectations but somewhat below the Conserved-Vector-Current predictions.