A determination of electroweak parameters at HERA

Using the deep inelastic e+p and e−p charged and neutral current scattering cross sections previously published, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The data used have been collected by the H1 experiment in 1994-2000 and correspond to an integrated luminosity of 117.2pb−1. A measurement is obtained of the W propagator mass in charged current ep scattering. The weak mixing angle sin2θW is determined in the on-mass-shell renormalisation scheme. A first measurement at HERA is made of the light quark weak couplings to the Z0 boson and a possible contribution of right-handed isospin components to the weak couplings is investigated.