Measurement of cross-sections and asymmetries in e +e − collisions at 130–140 GeV centre-of-mass energy

• Published in: Physics letters. B 1996-05, Vol.376 (1), p.232-244
• Main Authors: Alexander, G, Allison, J, Andrson, K.J, Anderson, S, Axen, D, Ball, A.H, Bartoldus, R, Beaudoin, G, Bechtluft, J, Behnke, T, Bell, A.N, Bella, G, Berlich, P, Bloodworth, I.J, Braibant, S, Burckhart, H.J, Charlton, D.G, Cooke, O.C, Cuffiani, M, Dado, S, De Jong, S, do Couto e Silva, E, Duckeck, G, Duerdoth, I.P, Evans, H.G, Fath, P, Fischer, H.M, Fukui, H, Fürtjes, A, Gascon, J, Gascon-Shotkin, S.M, Geddes, N.I, Gensler, S.W, Geralis, T, Goodrick, M.J, Gorn, W, Gruwé, M, Hajdu, C, Hapke, M, Hart, P.A, Hawkes, C.M, Hawkings, R, Hildreth, M.D, Hutchcroft, D.E, Jimack, M, Jones, R.W.L, Kanzaki, J, Kellogg, R.G, Kirk, J, Kowalewski, R, Kress, T, Kyberd, P, Layter, J.G, Lellouch, D, Loebinger, F.K, Marcellini, S, Markus, C, Martin, J.P, Mashimo, T, Matthews, W, McDonald, W.J, McMahon, T.J, Merritt, F.S, Michelini, A, Mikenberg, G, Müller, U, Nellen, B, Nisius, R, O'Neale, S.W, Ogren, H.O, Oreglia, M.J, Orito, S, Palazzo, M, Pásztor, G, Petzold, S, Pinfold, J, Ros, E, Runolfsson, O, Rylko, R, Sbarra, C, Scharf, F, Schenk, P, Schmitt, B, Scott, W.G, Shepherd-Themistocleous, C.H, Smith, A.M, Springer, R.W, Starks, M, Stephens, K, Tecchio, M, von Törne, E, Tscheulin, M, Verzocchi, M, Ward, C.P, Ward, D.R, Weber, P, Wermes, N, White, J.S, Wyatt, T.R, Zacek, V
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(96)00394-2

Production of events with multihadronic and leptonic final states has been measured in e +e − collisions at centre-of-mass energies significantly above the Z 0 mass, using the OPAL detector at LEP. A substantial production rate of radiative Z 0γ events was observed, as expected, together with events with less energetic initial-state photons. The cross-sections and leptonic forward-backward asymmetries were measured and compared with Standard Model expectations. In a model-independent fit to the Z 0 lineshape, the hadronic cross-section and lepton asymmetries presented here provide constraints on the size of the γZ 0-interference term which are complementary to those afforded by LEP data accumulated at the Z 0 resonance.