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Production cross section and topological decay branching fractions of the τ lepton
Baringer, Philip S.
Baringer, Philip S.
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Abstract
We report new measurements of the production cross section for the reaction e(+)e(−)→τ(+)τ(−) at s√=29 GeV, as well as the topological decay branching fractions of the τ lepton. The data were taken with the High Resolution Spectrometer at the SLAC e(+)e(−) colliding-beam facility PEP. The measured cross section yields Rττ=1.044±0.014±0.030 [where the first (second) error is statistical (systematic)], consistent with QED and corresponding to QED cutoff parameters of Λ+>129 GeV and Λ−>284 GeV at the 95% C.L. The fractions of τ decays into one and three charged particles are B1=0.864±0.003±0.003 and B3=0.135±0.003±0.003.
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.40.902.
Date
1989-08-01
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American Physical Society
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Baringer, Philip S. et al. (1989). "Production cross section and topological decay branching fractions of the τ lepton." Physical Review D, 1989(40):902. http://dx.doi.org/10.1103/PhysRevD.40.902