2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 13, 213-223
DOI 10.1007/s100520000317

Tau decays with neutral kaons

The OPAL Collaboration

G.Abbiendi$^{\rm 2}$ - et al.

2 Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, Italy

Received: 29 October 1999 / Published online: 24 February 2000 - © Springer-Verlag 2000

Abstract
The branching ratio of the $\tau$ lepton to a neutral kaon meson is measured from a sample of approximately 200,000 $\tau$ decays recorded by the OPAL detector at centre-of-mass energies near the Z0 resonance. The measurement is based on two samples which identify one-prong $\tau$ decays with \ensuremath{\mathrm{K^0_L}} and \ensuremath{\mathrm{K^0_S}} mesons. The combined branching ratios are measured to be

\begin{eqnarray*}B({\tau^-
\rightarrow \pi^- {\overline{\mathrm{K}}{}^0}
{\nu_\t...
...}} {\nu_\tau}
}
) & = & {{(3.30\pm0.55\pm0.39})\times 10^{-3}}
,
\end{eqnarray*}


where the first error is statistical and the second systematic.


Copyright Società Italiana di Fisica, Springer-Verlag 2000