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Study of tau decays to six pions and neutrino

Collaboration
Oct, 2000
11 pages
Published in:
  • Phys.Rev.Lett. 86 (2001) 4467-4471
e-Print:
DOI:
Report number:
  • SLAC-REPRINT-2000-074,
  • CLNS-00-1687,
  • CLEO-00-16
Experiments:
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Abstract: (arXiv)
The τ\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 B(τ−→2π−π+3π0ντ)=(2.2±0.3±0.4)×10−4{\cal B}(\tau^-\to 2\pi^-\pi^+3\pi^0\nu_{\tau})=(2.2 \pm 0.3 \pm 0.4)\times 10^{-4} and B(τ−→3π−2π+π0ντ)=(1.7±0.2±0.2)×10−4{\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 η\eta or ω\omega mesons. We present the first observation of the decay τ−→2π−π+ωντ\tau^-\to 2\pi^-\pi^+\omega\nu_{\tau} and the branching fraction is measured to be (1.2±0.2±0.1)×10−4(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.
  • electron positron: colliding beams
  • electron positron: annihilation
  • tau: pair production
  • tau-: semileptonic decay
  • pi: multiple production
  • final state: (6pi)
  • eta: intermediate state
  • omega(783): intermediate state
  • CVC model model
  • tau-: branching ratio