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T: Teilchenphysik

T 203: QCD 2

T 203.4: Vortrag

Dienstag, 27. März 2001, 14:45–15:00, HS XII

Longitudinal Structure Function F_L at High Q² — •Ana Dubak, Vladimir Chekelian, and Burkard Reisert — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München

Inclusive e⁻p and e+p 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 1998-1999 (e⁻p) and 1999-2000 (e⁺p) with a center-of-mass energy of 320 GeV and correspond to an integrated luminosity of 16.4 pb⁻¹ and 65.4 pb⁻¹, respectively. 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.