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Study of high-multiplicity 3-prong and 5-prong tau decays at BABAR

We present measurements of the branching fractions of 3-prong and 5-prong tau decay modes using a sample of 430 million tau lepton pairs, corresponding to an integrated luminosity of 468 fb-1, collected with the BaBar detector at the PEP-II asymmetric energy e+e- storage rings. The τ- --> (3π)- ην, τ- --> (3π)- ων, and τ- --> π- f_1(1285)ν, branching fractions are presented as well as a new limit on the branching fraction of the isospin-forbidden, second-class current, τ- --> π-η'(958)ν, decay. We find no evidence for charged kaons in these decay modes and place the first upper limits on their branching fractions.

preprint2012arXivOpen access
J. P. Lees
hep-ex
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J. P. Lees

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