2010/05/31 by D. South, David M. South, South, David M.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.1005.5729
4 pages, 6 figures, to appear in the proceedings of Lake Louise Winter Institute 2010, Feb 15-20 2010 (version 2: corrected 3 typos)
openalex publication_date 2010/05/31 · arxiv created 2010/06/01 · arxiv updated 2010/06/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
New measurements of neutral and charged current cross sections at large negative four-momentum transfer squared Q2 have been performed by H1 and ZEUS, using up to the complete HERA II ep data, which was taken with polarised electron and positron beams. The data are compared to predictions of the Standard Model, based on various parton distribution function parameterisations. The polarisation asymmetry of the neutral current interaction is measured as a function of Q2, as well as the polarisation dependence of the charged current cross section and both are found to be in agreement with the Standard Model expectation. The HERA II cross sections are also combined with previously published HERA I data to obtain the most precise unpolarised measurements.