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A combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The analysis is based on the deep inelastic e^+p and e^−p charged and neutral current scattering cross sections measured by the H1 experiment, including data with polarised lepton beams. The precision has been improved in particular for u quark coupling to the Z^0 boson with respect to the published results based on the unpolarised HERA data only. The determinations from HERA are compared with those from LEP and Tevatron.

Combined electroweak and QCD fits including NC and CC data with polarized electron beam at HERA-2