Measurement of the topological branching fractions of the τ lepton at LEP

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Abstract

Using data collected with the L3 detector at LEP from 1992 to 1995 on the Z peak, we determine the branching fractions of the τ lepton into one, three and five charged particles to be: B(τ → (1-prong)) = 85.274 ± 0.105 ± 0.073%, B(τ → (3-prong)) = 14.556 ± 0.105 ± 0.076%, B(τ → (5-prong)) = 0.170 ± 0.022 ± 0.026%. The first uncertainties are statistical and the second systematic. The accuracy of these measurements alone is similar to that of the current world average. © 2001 Elsevier Science B.V. All rights reserved.

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Achard, P., & Adriani, O. (2001). Measurement of the topological branching fractions of the τ lepton at LEP. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 519(3–4), 189–198. https://doi.org/10.1016/S0370-2693(01)01099-1

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