Measurement of charged and neutral current e-p deep inelastic scattering cross sections at high Q2

Deep inelastic e-p scattering has been studied in both the charged current (CC) and neutral current (NC) reactions at momentum transfers squared, Q2, between 400 GeV2 and the kinematic limit of 87500 GeV2 using the ZEUS detector at the HERA ep collider. The CC and NC total cross sections, the NC to CC cross section ratio, and the differential cross sections, dσ/dQ2, are presented. For Q2∝MW2, where MW is the mass of the W boson, the CC and NC cross sections have comparable magnitudes, demonstrating the equal strengths of the weak and electromagnetic interactions at high Q2. The Q2 dependence of the CC cross section determines the mass term in the CC propagator to be MW=76±16±13 GeV. (orig.)