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Abstract: New measurements of neutral and charged current cross sections at largenegative four-momentum transfer squared Q^2 have been performed by H1 and ZEUS,using up to the complete HERA II ep data, which was taken with polarisedelectron and positron beams. The data are compared to predictions of theStandard Model, based on various parton distribution functionparameterisations. The polarisation asymmetry of the neutral currentinteraction is measured as a function of Q^2, as well as the polarisationdependence of the charged current cross section and both are found to be inagreement with the Standard Model expectation. The HERA II cross sections arealso combined with previously published HERA I data to obtain the most preciseunpolarised measurements.

Autor: David M. South

Fuente: https://arxiv.org/

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