Measurement of neutral current deep inelastic e+p scattering cross sections with longitudinally polarized positrons with ZEUS at HERA

Measurements of neutral current deep inelastic scattering of protons colliding with longitudinally polarized positrons, performed with data recorded in years 2006 and 2007 with the ZEUS detector, corresponding to an integrated luminosity of L=113.3 pb-1, are presented. The single-differential cross sections dσ/dQ2, dσ/dx, dσ/dy and the double-differential reduced cross section σ were measured in the kinematic region of 185<Q2<50 000 GeV2 and y<0.95 at the center-of-mass energy of 319 GeV. The parity violating polarization asymmetry A+ and the generalized structure function x F3 were extracted. All measurements agree well with the predictions of the Standard Model. (orig.)