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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 theKEKB asymmetric-energy e^+e^- collider. We obtain the following branchingfractions: ${\cal B}(\tau^-\to K^- \eta \nu_{\tau})=(1.62\pm 0.05 \pm0.09)\times 10^{-4}$, ${\cal B}(\tau^-\to K^- \pi^0 \eta \nu_{\tau}) =(4.7\pm1.1 \pm 0.4)\times 10^{-5}$, ${\cal B}(\tau^-\to \pi^- \pi^0 \eta\nu_{\tau})=(1.39 \pm 0.03 \pm 0.07) \times 10^{-3}$, and ${\cal B}(\tau^-\toK^{*-} \eta \nu_{\tau})=(1.13\pm 0.19 \pm 0.07)\times 10^{-4}$ improving theaccuracy compared to the best previous measurements by factors of six, eight,four and four, respectively.

Precise measurement of hadronic $\tau$-decays in modes with $\eta$ mesons