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  • Measurements of Rb in e+e− ...
    Ainsley, C.; Alexander, G.; Amaral, P.; Anagnostou, G.; Bailey, I.; Bell, K.W.; Bellerive, A.; Benelli, G.; Bethke, S.; Bock, P.; Brown, R.M.; Campana, S.; Carter, A.A.; Carter, J.R.; Chang, C.Y.; Csilling, A.; Cuffiani, M.; Desch, K.; Dubbert, J.; Duchovni, E.; Duckeck, G.; Duerdoth, I.P.; Etzion, E.; Fabbri, F.; Fanfani, A.; Fleck, I.; Ford, M.; Gagnon, P.; Giacomelli, P.; Giunta, M.; Goldberg, J.; Gross, E.; Günther, P.O.; Gupta, A.; Hanson, G.G.; Hauschild, M.; Hemingway, R.J.; Jeremie, H.; Jovanovic, P.; Kanzaki, J.; Karlen, D.; Kawagoe, K.; Kawamoto, T.; Kellogg, R.G.; Kennedy, B.W.; Kobayashi, T.; Kobel, M.; Krämer, T.; Krieger, P.; von Krogh, J.; Kuhl, T.; Letts, J.; Lloyd, S.L.; Ludwig, A.; Martin, A.J.; Masetti, G.; Mashimo, T.; Mättig, P.; Menges, W.; Merritt, F.S.; Mes, H.; Meyer, N.; Michelini, A.; Mikenberg, G.; Mohr, W.; Montanari, A.; Mori, T.; Nakamura, I.; Nanjo, H.; Neal, H.A.; Nisius, R.; Oh, A.; Pahl, C.; Pilcher, J.E.; Rembser, C.; Rozen, Y.; Saeki, T.; Sarkisyan, E.K.G.; Schaile, O.; Schieck, J.; Schörner-Sadenius, T.; Schröder, M.; Seuster, R.; Shears, T.G.; Sobie, R.; Spano, F.; Stahl, A.; Torrence, E.; Toya, D.; Trigger, I.; Ueda, I.; Vollmer, C.F.; Voss, H.; Vossebeld, J.; Ward, C.P.; Ward, D.R.; Wells, P.S.; Wyatt, T.R.; Zer-Zion, D.; Zivkovic, L.

    Physics letters. B, 03/2005, Letnik: 609, Številka: 3-4
    Journal Article

    Measurements of Rb, the ratio of the bb¯ cross-section to the qq¯ cross-section in e+e− collisions, are presented. The data were collected by the OPAL experiment at LEP at centre-of-mass energies between 182 and 209 GeV. Lepton, lifetime and event-shape information is used to tag events containing b quarks with high efficiency. The data are compatible with the Standard Model expectation. The mean ratio of the eight measurements reported here to the Standard Model prediction is 1.055±0.031±0.037, where the first error is statistical and the second systematic.