Inclusive Deep Inelastic Scattering at High Q2 with Longitudinally Polarised Lepton Beams at HERA and Determination of the Integrated Luminosity at HERA using Elastic QED Compton Events

Abstract

Inclusive e ± p single and double differential cross sections for neutral a nd charged current deep inelastic scattering processes are measured with the H1 det ector at HERA. The data were taken at a centre-of-mass energy of √ s ≈ 319 GeV with a total integrated luminosity of 333.7 pb −1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The luminosity was determined exploiting the elastic QED Compton process ep → eγ p with a precision of 2.3%. The differential cross sections are measured in the range of negative four-momentum transfer squared, Q 2 , between 60 and 50 000 GeV 2 , and Bjorken x between 0.0008 and 0.65. The measurements are combined with earlier published unpolarised H1 data to improve statistical precision and used to determine the structure function xF γZ 3 . A measurement of the neutral current parity violating structure function F γZ 2 is presented for the first time. The polarisation dependence of the charged current total cross section is also measured. The new measurements are well described by a next-to-leading order QCD fit based on all publis hed H1 inclusive cross section data which are used to extract the parton distribution functions of the proton.