Study of $τ$ Decays to Four-Hadron Final States with Kaons

24 June 2005

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 94 (24) , 241802
https://doi.org/10.1103/physrevlett.94.241802

Abstract

The rare

τ

lepton decays to four explicitly identified hadrons have been studied with the CLEO detector at the Cornell Electron Storage Ring using

(7.56 \pm 0.15) {fb}^{- 1}

of data collected near

\sqrt{s} = 10.58 GeV

. The first statistically significant measurements of

B (τ^{-} \to K^{-} π^{+} π^{-} π^{0} ν_{τ}, excluding K^{0}) = (7.4 \pm 0.8 \pm 1.1) \times 10^{- 4}

and

B (τ^{-} \to K^{-} K^{+} π^{-} π^{0} ν_{τ}) = (5.5 \pm 1.4 \pm 1.2) \times 10^{- 5}

are presented, including the first observation of the decay

τ^{-} \to K^{-} ω ν_{τ}

with branching fraction,

(4.1 \pm 0.6 \pm 0.7) \times 10^{- 4}

. We publish the first upper limit for

B (τ^{-} \to K^{-} K^{+} K^{-} π^{0} ν_{τ}) < 4.8 (6.1) \times 10^{- 6}

at 90% (95%) confidence level. We measure for the first time the invariant mass distributions, which together with the branching fraction measurements are important ingredients that can be used to extract the standard model parameters, the strange quark mass, and the Cabibbo-Kobayashi-Maskawa element

V_{u s}

Keywords

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Version 1, 2005-01-17, ArXiv

This publication has 16 references indexed in Scilit:

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Physical Review Letters, 2005
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Study ofτDecays to Four-Hadron Final States with Kaons

Abstract

Keywords

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Study of $τ$ Decays to Four-Hadron Final States with Kaons