Study of the Decay τ−→2π−π+3π0ντ
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ID: 271753
1997
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Abstract
The decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}2{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}3{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ has been studied with the CLEO II detector at the Cornell Electron Storage Ring. The branching fraction is measured to be $(2.85\ifmmode\pm\else\textpm\fi{}0.56\ifmmode\pm\else\textpm\fi{}0.51)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The result is in good agreement with the isospin expectation but somewhat below the conserved-vector-current prediction. We have searched for resonance substructure in the decay. Within the statistical precision, the decay is saturated by the channels ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}2{\ensuremath{\pi}}^{0}\ensuremath{\omega}{\ensuremath{\nu}}_{\ensuremath{\tau}}$, $2{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}}$, and ${\ensuremath{\pi}}^{\ensuremath{-}}2{\ensuremath{\pi}}^{0}\ensuremath{\eta}{\ensuremath{\nu}}_{\ensuremath{\tau}}$. This is the first observation of this \ensuremath{\omega} decay mode and the branching fraction is measured to be $({1.89}_{\ensuremath{-}0.67}^{+0.74}\ifmmode\pm\else\textpm\fi{}0.40)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$.
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1997physicalstudy
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| Journal | physical review letters |
| Year | 1997 |
| DOI |
doi:10.1103/PhysRevLett.79.3814
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