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Using a data sample corresponding to an integrated luminosity of 342$fb^{-1}$ collected with the BABAR detector at the SLAC PEP-IIelectron-positron storage ring operating at a center-of-mass energy near 10.58GeV, we measure ${\cal{B}} (\tau^- \to \pi^- \pi^- \pi^+ \nu_\tau) = (8.83 \pm0.01 \pm 0.13) %$, ${\cal{B}} (\tau^- \to K^- \pi^- \pi^+ \nu_\tau) = (0.273\pm0.002\pm 0.009)%$, ${\cal{B}} (\tau^- \to K^- \pi^- K^+ \nu_\tau) = (0.1346\pm0.0010 \pm 0.0036)%$ and ${\cal{B}} (\tau^- \to K^- K^- K^+ \nu_\tau) =(1.58\pm 0.13 \pm 0.12)\times 10^{-5}$, where the uncertainties are statisticaland systematic, respectively. Events where the $\pi^+\pi^-$ pair is consistentwith coming from a $K^0_S$ are excluded. These are significant improvementsover previous measurements, with the ${\cal{B}} (\tau^- \to K^- K^- K^+\nu_\tau)$ result being the first resonant plus non-resonant measurement ofthis mode. We also report a first measurement of ${\cal{B}} (\tau^- \to\phi\pi^- \nu_\tau) = (3.42\pm 0.55 \pm 0.25)\times 10^{-5}$ and a newmeasurement of ${\cal{B}} (\tau^- \to \phi K^- \nu_\tau) = (3.39\pm 0.20 \pm0.28)\times 10^{-5}$.

physical review letters

Exclusive branching fraction measurements of semileptonic tau decays  into three charged hadrons, $\tau^- \to \phi \pi^- \nu_\tau$ and $\tau^- \to  \phi K^- \nu_\tau$