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

The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic \(e^+p\) and \(e^-p\) neutral currentand charged current scattering cross sectionspublished by the H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Modelparameters in the on-shell scheme are performed. The mass of the W boson is determined as \(m_W=80.520\pm 0.115~\mathrm {GeV} \). The axial-vector and vector couplings of the light quarks to the Z boson are also determined. Both results improve the precision of previous H1 determinations based on HERA-I data by about a factor of two. Possible scale dependence of the weak coupling parametersin both neutral and charged currentinteractions beyond the Standard Modelis also studied. All results are found to be consistent with the Standard Modelexpectations.