EPJ

2022 Impact factor 4.4
EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 4, 193-206
DOI 10.1007/s100529800893

Measurement of the one-prong hadronic tau branching ratios
at LEP

OPAL Collaboration

K.Ackerstaff8 - et al.

8 CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland

Received: 4 December 1997 / Published online: 2 June 1998

Abstract
The branching ratios of the $\tau^- \rightarrow h^- \, \nu_\tau$, $\tau^- \rightarrow h^- \, \pi^0 \nu_\tau$ and $\tau^- \rightarrow h^- \, \geq 2 \pi^0 \nu_\tau$ 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


\begin{tabular} {l c c} \\ BR($\tau^- \rightarrow h^- \, \nu_\tau$) & = & $(11.9... ...geq 2 \pi^0 \nu_\tau$\space ) & = & $(9.91 \pm 0.31 \pm 0.27)\, \%$\end{tabular}
where the first error is statistical and the second is systematic.

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