Measurement of the reaction e+e− → τ+τ− at √s = 29 GeV

K. K. Gan, I. Beltrami, B. G. Bylsma, R. Debonte, D.S. Koltick, F. J. Loeffler, E. H. Low, R. L. McIlwain,D. H. Miller,C. R. Ng, P. P. Ong,L. K. Rangan,E. I. Shibata,Robert Wilson, M. Derrick,E. Fernandez, R. Fries,L. G. Hyman,P. Kooijman, J. S. Loos,B. Musgrave,L. E. Price, J. Schlereth, K. Sugano, J.M. Weiss, D. E. Wood, G. Baranko, P. Baringer, D. Blockus, B. B. Brabson,G. E. Forden,S. W. Gray,C. K. Jung, H. A. Neal, H. O. Ogren,D. R. Rust, M. Valdata-Nappi,Carl W. Akerlof, G. Bonvicini, J. W. Chapman,D. Errede, N. Harnew, P. Kesten, S. Kooijman,D. I. Meyer, D. Nitz, D. Rubin, A. A. Seidl,R. P. Thun, T. Trinko, M. Willutzky, B. Cork, L.P. Keller, J. Va’vra

Physics Letters B（1985）

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摘要

Abstract The reaction e+e− → τ+τ− has been measured using the high resolution spectrometer at PEP. The angular distribution shows a forward-backward asymmetry of −(6.1±2.3±0.5)%, corresponding to an axial-vector coupling if gaτgae = 0.28 ±0.11± 0.03, in good agreement with the standard model of electroweak interactions. The measured cross section yields ifRττ = 1.10± 0.03±0.04, consistent with QED and giving QED cutoff parameters of Λ+>92 GeV and Λ−>246 GeV at 95% C.L.

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