A study of one-prong Tau decays with a charged kaon

The OPAL Collaboration G. Abbiendi; et al.

doi:doi:10.1007/s100520100632

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Particles and Fields

Eur. Phys. J. C 19, 653-665
DOI: 10.1007/s100520100632

A study of one-prong Tau decays with a charged kaon

The OPAL Collaboration
G. Abbiendi and et al.

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

(Received: 5 July 2000 / Published online: 6 April 2001 -© Springer-Verlag 2001)

Abstract
From an analysis of the ionisation energy loss of charged particles selected from 110326 e⁺e^- $\rightarrow \tau^+\tau^-$ candidates recorded by the OPAL detector at e⁺e^- centre-of-mass energies near the Z⁰ resonance, we determine the one-prong tau decay branching ratios:
Br $(\tau^- \rightarrow \nu_\tau {\rm K}^- \ge 0{\rm h}^0)$ = $(1.528 \pm 0.039 \pm 0.040)\%$
${\rm Br}(\tau^- \rightarrow \nu_\tau{\rm K}^-)$ = $(0.658 \pm 0.027 \pm 0.029)\%$
where the ${\rm h}^0$ notation refers to a $\pi^0$ , an $\eta$ , a ${\rm K}^0_{\rm S}$ , or a ${\rm K}^0_{\rm L}$ , and where the first uncertainty is statistical and the second is systematic.