Phys. Rev. Lett. 82, 281–285 (1999)

First Observation of the Decay τ^-→K^*-ην_τ

Abstract

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M. Bishai et al. (CLEO Collaboration)
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Received 15 September 1998; published in the issue dated 11 January 1999

The decay τ^-→K^*-ην_τ has been observed with the CLEO II detector. The K^*- is reconstructed in two decay channels, K^*-→K_Sπ^-→π^-π⁺π^- and K^*-→K^-π⁰. The η is reconstructed from the decay η→γγ. The measured branching fraction is B(τ^-→K^*-ην_τ) = (2.9±0.8±0.4)×10^-4. We also measure the inclusive branching fractions without requiring the K^* resonance, B(τ^-→K_Sπ^-ην_τ) = (1.10±0.35±0.11)×10^-4 and B(τ^-→K^-π⁰ην_τ) = (1.77±0.56±0.71)×10^-4. The results indicate that the K^*- resonance dominates the K_Sπ^- mass spectrum.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.82.281

DOI:

10.1103/PhysRevLett.82.281

PACS:

13.35.Dx

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Phys. Rev. Lett. 82, 281–285 (1999)

First Observation of the Decay τ-→K*-ηντ

First Observation of the Decay τ^-→K^*-ην_τ