Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-08-21
Eur.Phys.J.C51:289-299,2007
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 4 figures, 4 tables
Scientific paper
10.1140/epjc/s10052-007-0310-y
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.
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