| Abstract |
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Title: Measurement of the tau->3pietanu Branching Fraction and a Search
for a Second-Class Current in the tau->eta'(958)pinu Decay.
Authors: The Babar Collaboration, M.Lewczuk et al.
Comments: 9 pages, 7 eps figures.
Report-no: BaBar-PUB-07/061, SLAC-PUB-13143
The "tau to 3pi eta nu" decay with the "eta to gamma gamma" mode
is studied using 384 fb^-1 of data collected by the BaBar detector.
The branching fraction is measured to be (1.60+/-0.05+/-0.11)x10^-4.
It is found that "tau to f1 pi nu to 3pi eta nu" is the dominant decay mode with a branching fraction of (1.11+/-0.06+/-0.05)x10^-4. The first error on the branching fractions is statistical and
the second systematic. In addition, a 90\% confidence level upper limit on the branching fraction of the
"tau to eta'(958) pi nu" decay is measured to be 7.2x10^-6.
This last decay proceeds through a second-class current and is expected to be
forbidden in the limit of isospin symmetry.
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