Measurement of e+e−→τ+τ− at high energy and properties of the τ lepton |
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Authors: | H.J. Behrend,Ch. Chen,H. Fenner,J.H. Field,V. Schr?der,H. Sindt,G. D Agostini,W.D. Apel,S. Banerjee,J. Bodenkamp,D. Chrobaczek,J. Engler,G. Flügge,D.C. Fries,W. Fues,K. Gamerdinger,G. Hopp,F. Pierre |
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Affiliation: | 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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