Study of $τ$ Decays to Six Pions and Neutrino

Details Study of $τ$ Decays to Six Pions and Neutrino Study of $τ$ Decays to Six Pions and Neutrino

2000-10-12

arxiv.org/abs/hep-ex/0010025v1

Phys.Rev.Lett.86:4467-4471,2001

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevLett.86.4467

The $\tau$ decays to six-pion final states have been studied with the CLEO detector at the Cornell Electron Storage Ring. The measured branching fractions are ${\cal B}(\tau^-\to 2\pi^-\pi^+3\pi^0\nu_{\tau})=(2.2 \pm 0.3 \pm 0.4)\times 10^{-4}$ and ${\cal B}(\tau^-\to 3\pi^-2\pi^+\pi^0\nu_{\tau})=(1.7 \pm 0.2 \pm 0.2)\times 10^{-4}$. A search for substructure in these decays shows that they are saturated by intermediate states with $\eta$ or $\omega$ mesons. We present the first observation of the decay $\tau^-\to 2\pi^-\pi^+\omega\nu_{\tau}$ and the branching fraction is measured to be $(1.2 \pm 0.2 \pm 0.1) \times 10^{-4}$. The measured branching fractions are in good agreement with the isospin expectations but somewhat below the Conserved-Vector-Current predictions.

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