First Observation of the Decay $τ^{-}\to K^{*-}ην_τ$

Details First Observation of the Decay $τ^{-}\to K^{*-}ην_τ$ First Observation of the Decay $τ^{-}\to K^{*-}ην_τ$

1998-09-15

arxiv.org/abs/hep-ex/9809012v1

Phys.Rev.Lett.82:281-285,1999

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevLett.82.281

Using data recorded by the CLEO-II detector at CESR, we report the first measurement of the branching fraction for the decay of $\tau^-$ into $K^{*-}\eta \nu_{\tau}$. The measured branching fraction is (2.9 +- 0.8 +- 0.4) $10^{-4}$. We also measure the inclusive branching fractions without requiring the $K^*$ resonance: $\tau^-$ into $K_S \pi^- \eta \nu_{\tau}$, $\tau^-$ into $K^- \pi^0 \eta \nu_{\tau}$. The measured branching fractions are (1.10 +- 0.35 +- 0.11) $10^{-4}$, (1.77 +- 0.56 +- 0.71) $10^{-4}$ respectively.

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