| Abstract |
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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-II electron-positron storage ring operating at a
center-of-mass energy near 10.58 GeV, we measure
${\cal{B}} (\tau^- \rightarrow \pi^- \pi^- \pi^+ \nu_\tau) = (8.83 \pm 0.01 \pm 0.13) \%$,
${\cal{B}} (\tau^- \rightarrow K^- \pi^- \pi^+ \nu_\tau) = (0.273\pm 0.002\pm 0.009)\%$,
${\cal{B}} (\tau^- \rightarrow K^- \pi^- K^+ \nu_\tau) = (0.1346\pm 0.0010 \pm 0.0036)\%$ and
${\cal{B}} (\tau^- \rightarrow K^- K^- K^+ \nu_\tau) = (1.58\pm 0.13 \pm 0.12)\times 10^{-5}$,
where the uncertainties are statistical and systematic, respectively.
Events where the $\pi^+\pi^-$ pair is consistent with coming from a $K^0_S$ are excluded.
These are significant improvements over previous measurements, with the
${\cal{B}} (\tau^- \rightarrow K^- K^- K^+ \nu_\tau)$ result
being the first resonant plus non-resonant measurement of this mode.
We also report a first measurement of
${\cal{B}} (\tau^- \rightarrow \phi\pi^- \nu_\tau) = (3.42\pm 0.55 \pm 0.25)\times 10^{-5}$
and a new measurement of
${\cal{B}} (\tau^- \rightarrow \phi K^- \nu_\tau) = (3.39\pm 0.20 \pm 0.28)\times 10^{-5}$.
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