Electroweak physics at HERA
  The HERA experiments have collected interesting luminosity samples with both polarized and unpolarized lepton beams. The polarized CC data are directly sensitive to right handed charged currents. The data are in agreement with the SM predicting their absence. Effects of Z-exchange have been seen in the lepton beam charge and polarization assymetries. A combined electroweak and QCD analysis allows one to measure electroweak parameters with world competitive accuracy. 
Juraj Bracinik (for H1 and ZEUS collaborations)