2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 10, 1-18
DOI 10.1007/s100529900146

One-prong $\tau$ decays with kaons

The ALEPH Collaboration

R. Barate - et al.

Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, F-74019 Annecy-le-Vieux Cedex, France

Received: 24 February 1999 / Published online: 15 July 1999

Abstract
One-prong $\tau$ decays into final states involving kaons are studied with about 161000 $\tau^+\tau^-$ events collected by the ALEPH detector from 1991 to 1995. Charged kaons are identified by dE/dx measurement, while K0L's are detected through their interaction in calorimeters. Branching ratios are measured for the inclusive mode, $B(\tau^-\rightarrow K^-X\nu_\tau)=(1.52 \pm 0.04\pm0.04)\%$, where X can be any system of neutral particles, and for the exclusive modes


\begin{tabular}
{rcl}
$B(\tau^-\to K^-\nu_\tau)$\space &=& $(6.96\pm0.25\pm0.14)...
 ...i^{-}\pi^0\nu_\tau)$\space &=& $(3.47\pm0.53\pm0.37)\times10^{-3}$,\end{tabular}
where the first error is statistical and the second is systematical. Upper limits for $B(\tau^-\to \overline{K^0}\pi^{-}\pi^0\pi^0\nu_\tau)$ and $B(\tau^-\to K^{-}K^{0}\pi^0\pi^0\nu_\tau)$ are also obtained. Mass spectra in the final states are investigated in order to study the relevant dynamics.


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