Measurement and QCD analysis of neutral and charged current cross sections at HERA.

Adloff, C. and Andreev, V. and Andrieu, B. and Anthonis, T. and Astvatsatourov, A. and Babaev, A. and Bähr, J. and Baranov, P. and Barrelet, E. and Bartel, W. and Baumgartner, S. and Becker, J. and Beckingham, M. and Beglarian, A. and Behnke, O. and Belousov, A. and Berger, Ch. and Berndt, T. and Bizot, J.C. and Böhme, J. (2003) Measurement and QCD analysis of neutral and charged current cross sections at HERA. European Physical Journal C: Particles and Fields, 30 (1). pp. 1-32. ISSN 1434-6044

Abstract

The inclusive e⁺p single and double differential cross sections for neutral and charged current processes are measured with the Hi detector at HERA. The data were taken in 1999 and 2000 at a centre- of-mass energy of √s 319 GeV and correspond to an integrated luminosity of 65.2 pb^-1. The cross sections are measured in the range of four-momentum transfer squared Q² between 100 and 30000 GeV² and Bjorken x between 0.0013 and 0.65. The neutral current analysis for the new e⁺p data and the earlier e^-p data taken in 1998 and 1999 is extended to small energies of the scattered electron and therefore to higher values of inelasticity y, allowing a determination of the longitudinal structure function FL at high Q² (110-700GeV²). A new measurement of the structure function xF₃ is obtained using the new e+p and previously published e+p neutral current cross section data at high Q². These data together with Hi low Q² precision data are further used to perform new next-to-leading order QCD analyses in the framework of the Standard Model to extract flavour separated parton distributions in the proton. [ABSTRACT FROM AUTHOR]