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Measurement of azimuthal asymmetries in neutral current deep inelastic scattering at HERA

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Piotrzkowski, Krzysztof [UCL] Chekanov, S. de Favereau, J. [UCL]

(eng) The distribution of the azimuthal angle of charged and neutral hadrons relative to the lepton plane has been studied for neutral current deep inelastic $ep$ scattering using an integrated luminosity of 45 pb-1 taken with the ZEUS detector at HERA. The measurements were made in the hadronic centre-of-mass system. The analysis exploits the energy-flow method, which allows the measurement to be made over a larger range of pseudorapidity compared to previous results. The dependence of the moments of the azimuthal distributions on the pseudorapidity and minimum transverse energy of the final-state hadrons are presented. Although the predictions from next-to-leading-order QCD describe the data better than do the Monte Carlo models incorporating leading-logarithm parton showers, they still fail to describe the magnitude of the asymmetries. This suggests that higher-order calculations may be necessary to describe these data. Comment: 10 pages, 4 figures, 4 tables

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2007
Journal information "European Physical Journal C. Particles and Fields" - Vol. 51, p. 289-299 (2007)
Publisher Springer (Heidelberg)
issn 1434-6044
e-issn 1434-6052
Publication status Publié
Affiliation UCL
Keywords High Energy Physics - Experiment
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Bibliographic reference Piotrzkowski, Krzysztof ; Chekanov, S. ; de Favereau, J. ; et. al. Measurement of azimuthal asymmetries in neutral current deep inelastic scattering at HERA. In: European Physical Journal C. Particles and Fields, Vol. 51, p. 289-299 (2007)
Permanent URL http://hdl.handle.net/2078/31885