Heavy Flavour Electroweak Physics Review

The four LEP experiments and the SLD detector have measured the Z partial widths in the processes ee→Z→bb and ee→Z→cc and the corresponding forward-backward asymmetries at centre-of-mass energies close to mZ. The results yield a very precise determination of the effective vector and axial-vector coupling constants and of the underlying electroweak mixing angle sinθ lept eff , probing the Standard Model prediction for the electroweak radiative corrections. Of special interest is hereby a difference at the level of three standard deviations in the mixing angle results from lepton production and those obtained from the forwardbackward asymmetry in b quark production. The b quark asymmetry measurements, some of which are still in the process of being finalised, are therefore discussed in detail.