Measurement of high- Q2 neutral current deep inelastic e− p scattering cross sections with a longitudinally polarised electron beam at HERA.

Measurements of the neutral current cross sections for deep inelastic scattering in e− p collisions at HERA with a longitudinally polarised electron beam are presented. The single-differential cross-sections d σ/ dQ2, d σ/ dx and d σ/ dy and the double-differential cross sections in Q2 and x are measured in the kinematic region y<0.9 and Q2>185 GeV2 for both positively and negatively polarised electron beams and for each polarisation state separately. The measurements are based on an integrated luminosity of 169.9 pb−1 taken with the ZEUS detector in 2005 and 2006 at a centre-of-mass energy of 318 GeV. The structure functions $x\tilde{F_{3}}$ and xF are determined by combining the e− p results presented in this paper with previously measured e+ p neutral current data. The asymmetry parameter A− is used to demonstrate the parity violating effects of electroweak interactions at large spacelike photon virtuality. The measurements agree well with the predictions of the Standard Model. [ABSTRACT FROM AUTHOR]