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T: Fachverband Teilchenphysik

T 32: QCD V

T 32.3: Vortrag

Freitag, 19. März 2010, 14:30–14:45, HG X

Neutral Current Interactions in e^±p Scattering with Longitudinally Polarised Leptons. — •Stanislav Shushkevich — Max-Planck Institut für Physik, Föhringer Ring 6, 80805, München, Germany

The inclusive single differential cross section dσ/dQ² and the double differential cross section dσ(x,Q²)/dxdQ² are measured for the neutral current process, e^±p → e^± X, in interactions with longitudinally polarised lepton beams using the complete HERA-II data set. The cross sections are measured in the region of large negative four-momentum transfer squared, Q² ≥ 200 GeV². The data provide the measurements of the interference structure function xF₃^{γ Z}, which is sensitive to the valence quark distributions down to lower values of Bjorken x. The data on polarised cross section asymmetries, A^±, lead to the observation of parity violation in neutral current e^± p scattering. Standard Model is able to provide a good description of the data.