Precise measurement of hadronic $τ$-decays in modes with $η$ mesons

Details Precise measurement of hadronic $τ$-decays in modes with $η$ mesons Precise measurement of hadronic $τ$-decays in modes with $η$ mesons

2007-08-06

arxiv.org/abs/0708.0733v1

Physics

High Energy Physics

High Energy Physics - Experiment

BELLE-CONF-0714; contributed to EPS 2007 and Lepton Photon 2007

Scientific paper

We have measured branching fractions of hadronic $\tau$ decays involving an $\eta$ meson using 485 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We obtain the following branching fractions: ${\cal B}(\tau^-\to K^- \eta \nu_{\tau})=(1.62\pm 0.05 \pm 0.09)\times 10^{-4}$, ${\cal B}(\tau^-\to K^- \pi^0 \eta \nu_{\tau}) =(4.7\pm 1.1 \pm 0.4)\times 10^{-5}$, ${\cal B}(\tau^-\to \pi^- \pi^0 \eta \nu_{\tau})=(1.39 \pm 0.03 \pm 0.07) \times 10^{-3}$, and ${\cal B}(\tau^-\to K^{*-} \eta \nu_{\tau})=(1.13\pm 0.19 \pm 0.07)\times 10^{-4}$ improving the accuracy compared to the best previous measurements by factors of six, eight, four and four, respectively.

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