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Measurement of Tau branching ratios

Decamp, D. and Finch, Alexander (1992) Measurement of Tau branching ratios. Zeitschrift für Physik C Particles and Fields, 54 (2). pp. 211-228. ISSN 0170-9739

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Abstract

Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the τ lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the τ decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes τ→3 hadrons+vτ andτ→hadron+2π0vτ, which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.

Item Type: Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63783
Deposited By: ep_importer_pure
Deposited On: 07 May 2013 15:32
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:04
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63783

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