Measurement of the one prong hadronic tau branching ratios at LEP

The branching ratios of the \tau^- -> h^- \nu_\tau, \tau^- -> h^- \pi^0 \nu_\tau, \tau^- -> h^- >=2 \pi^0 \nu_\tau decays have been measured using the 1991-1995 data recorded with the OPAL detector at LEP. These branching ratios are measured simultaneously using three selection criteria and are found to be BR(\tau^- -> h^- \nu_\tau) = (11.98 +/- 0.13 +/- 0.16)% BR(\tau^- -> h^- \pi^0 \nu_\tau) = (25.89 +/- 0.17 +/- 0.29)% BR(\tau^- -> h^- >=2 \pi^0 \nu_\tau) = ( 9.91 +/- 0.31 +/- 0.27)% where the first error is statistical and the second is systematic.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
tau: pair production
tau-: semileptonic decay
tau-: branching ratio
final state: (1charged particle)
OPAL
experimental results
CERN LEP Stor

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