Study of τ Decays to Six Pions and a Neutrino

Publisher Website

14 May 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 86 (20) , 4467-4471
https://doi.org/10.1103/physrevlett.86.4467

Abstract

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^{-} \to 2 π^{-} π^{+} 3 π^{0} ν_{τ}) = (2.2 \pm 0.3 \pm 0.4) \times 1 0^{- 4}

and

B (τ^{-} \to 3 π^{-} 2 π^{+} π^{0} ν_{τ}) = (1.7 \pm 0.2 \pm 0.2) \times 1 0^{- 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^{-} \to 2 π^{-} π^{+} ω ν_{τ}

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.

Keywords

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