Journal article
Measurements of Rb, AbFB, and AcFB in e e- collisions at 130 - 189 GeV
G Abbiendi, K Ackerstaff, PF Akesson, G Alexander, J Allison, KJ Anderson, S Arcelli, S Asai, SF Ashby, D Axen, G Azuelos, I Bailey, AH Ball, E Barberio, RJ Barlow, JR Batley, S Baumann, T Behnke, KW Bell, G Bella Show all
European Physical Journal C | SPRINGER | Published : 2000
Abstract
The cross-section ratio Rb = σ(e+e- → bb̄)/σ(e+e- → qq̄) and the bottom and charm forward-backward asymmetries AbFB and AcFB are measured using event samples collected by the OPAL detector at centre-of-mass energies between 130 and 189 GeV. Events with bottom quark production are selected with a secondary vertex tag, and a hemisphere charge algorithm is used to extract AbFB. In addition, the bottom and charm asymmetries are measured using leptons from semileptonic decays of heavy hadrons and pions from D*+ → D0π+ decays. The results are in agreement with the Standard Model predictions.