Measurement of e+e?→τ+τ? at high energy and properties of the τ lepton |
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| Authors: | HJ Behrend Ch Chen H Fenner JH Field V Schr?der H Sindt G D&#x;Agostini WD Apel S Banerjee J Bodenkamp D Chrobaczek J Engler G Flügge DC Fries W Fues K Gamerdinger G Hopp F Pierre |
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| Institution: | Deutsches Elektronen Synchrotron DESY, Hamburg, Germany;Kernforschungszentrum Karsruhe and Universität Karlsruhe, Karlsruhe, Germany |
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| Abstract: | The e+e?→τ+τ? process has been measured using the CELLO detector at a mean total centre of mass energy of 34.2 GeV using essentially all the decay channels of the τ lepton. The measured cross section yields Rτ=1.03±0.05 (stat)±0.07 (syst). Topological branching fraction are given for τ → 1, 3 or 5 charged tracks. The angular distribution shows a clear 1 + cos2θ dependance with a forward-backward asymmetry of -0.103 ± 0.052 corresponding to an axial-vector coupling aτ of the τ to the weak neutral current given by aτ=?1.12 ± 0.57. |
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| Keywords: | Cello Collaboration |
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