The b quark forward-backward asymmetry has been measured using hadronic Z0 decays collected by the OPAL experiment at LEP. Z0 → bb̄ decays were selected using a combination of secondary vertex and lepton tags, and the sign of the b quark charge was determined using an inclusive tag based on jet, vertex and kaon charges. The results, corrected to the quark level, are: AFBb= 0.0582 ± 0.0153 ± 0.0012 at √s = 89.50 GeV, AFBb= 0.0977 ± 0.0036 ± 0.0018 at √s = 91.26 GeV, AFBb= 0.1221 ± 0.0123 ± 0.0025 at √s = 92.91 GeV, where the first error is statistical and the second systematic in each case. Within the framework of the Standard Model, the result is interpreted as a measurement of the effective weak mixing angle for electrons of sin2θweff,e = 0.23205 ± 0.00068.
|Number of pages||19|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 17 Oct 2002|