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T: Teilchenphysik

T 303: QCD III

T 303.1: Talk

Tuesday, March 19, 2002, 14:30–14:45, HS 10

High Q² Neutral Current Cross Section Measurements — •Ana Dubak, Vladimir Chekelian, and Burkard Reisert — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München

Inclusive e⁺p single and double differential cross sections for neutral current processes are measured with the H1 detector at HERA, in the range of four-momentum transfer squared Q² between 100 and 30000 GeV², and Bjorken x between 0.0013 and 0.65. The data were taken in 1999-2000 with a center-of-mass energy of 320 GeV and correspond to an integrated luminosity 65.4 pb⁻¹. An extension of the cross section measurement to the high inelasticity region (y=0.75) makes possible a measurement of the longitudinal structure function F_L in the Q² range from 100 to 800 GeV². The results are well described by the QCD prediction.