A Determination of electroweak parameters at HERA

Using the deep inelastic e(+) p and e(-) p charged and neutral current scattering cross sectionspreviously 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 HI experiment in 1994-2000 and correspond to an integrated luminosity of 117.2 pb(-1). A measurement is obtained of the W propagator mass in charged currentep scattering. The weak mixing angle sin(2)theta w is determined in the on-mass-shell renormalisation scheme. A first measurement at HERAis made of the light quark weak couplings to the Z(0) boson and a possible contribution of right-handed isospincomponents to the weak couplings is investigated. (c) 2005 Elsevier B.V. All rights reserved.