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Test of QED in e+e− annihilation at energies between 12 and 31.6 GeV

By R Brandelik, W Braunschweig, K Gather, V Kadansky, K Lübelsmeyer, P Mättig, H Martyn, G Peise, J Rimkus, H Sander, D Schmitz, A Schultz von Dratzig, D Trines, W Wallraff, H Boerner, H. M. Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Koepke, P Leu, B Löhr, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, D.G. Cassel, D Heyland, H Hultschig, P Joos, W Koch, P Koehler, U Kötz, H Kowalski, A Ladage, D Lüke, H.L. Lynch, G Mikenberg, D Notz, J Pyrlik, R Riethmüller, M Schliwa, P Söding, B.H. Wiik, G Wolf, R Fohrmann, M Holder, G Poelz, O Römer, R Rüsch, P Schmüser, D.M. Binnie, P.J. Dornan, N.A. Downie, D.A. Garbutt, W.G. Jones, S.L. Lloyd, D Pandoulas, J Sedgbeer, S Yarker, C Youngman, Roger Barlow, I Brock, R.J. Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, B Roe, G.L. Salmon, T Wyatt, K.W. Bell, B Foster, J.C. Hart, J Proudfoot, D.R. Quarrie, D.H. Saxon, P.L. Woodworth, Y Eisenberg, U Karshon, D Revel, E Ronat, A Shapira, J Freeman, P Lecomte, T Meyer, Sau Lan Wu and G Zobernig


We have measured the reactions e+e− → e+e− → μ+μ− and e+e− → γγ at c.m. energies between 12 and 31.6 GeV. Excellent agreement with the predictions of QED has been found, resulting in cut off parameters Λ+ > 112 GeV and Λ− > 139 GeV for the first process and Λ+ > 34 GeV and Λ− > 42 GeV (95% c.1.) for the last one. A limit on the Weinberg angle of sin2θW < 0.55 (95% c.1.) has been obtained

Topics: QC
Publisher: Elsevier
Year: 1980
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