The first observation of $τ^{\pm} \to ϕK^{\pm} ν$ decay

We present the first measurement of tau-decays to hadronic final states with a $ϕ$-meson. This is based on 401.4 fb$^{-1}$ of data accumulated at the Belle experiment. The branching ratio obtained is $B(τ^{\pm}\toϕK^{\pm}ν) = (4.06\pm 0.25\pm 0.26)\times 10^{-5}$.

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