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The parameters of the electroweak theory are determined in a combinedelectroweak and QCD analysis using all deep-inelastic $e^+p$ and $e^-p$ neutralcurrent and charged current scattering cross sections published by the H1Collaboration, including data with longitudinally polarised lepton beams.Various fits to Standard Model parameters in the on-shell scheme are performed.The mass of the $W$ boson is determined as $m(W)=80.520\pm 0.115$ GeV. Theaxial-vector and vector couplings of the light quarks to the $Z$ boson are alsodetermined. Both results improve the precision of previous H1 determinationsbased on HERA-I data by about a factor of two. Possible scale dependence of theweak coupling parameters in both neutral and charged current interactionsbeyond the Standard Model is also studied. All results are found to beconsistent with the Standard Model expectations.

Determination of electroweak parameters in polarised deep-inelastic scattering at HERA