Hadronic energy distributions in deep-inelastic electron-proton scattering

This paper presents energy distributions of the hadronic system produced in neutral-currentelectron-proton deep-inelastic scatteringat a centre of mass energy of 296 GeV. Comparison of the results with QCD Monte Carlo models shows that QCD radiation has a strong influence on the characteristics of the final state. The data are reasonably reproduced by the Lund model based on a matrix element calculation in first order ofαs, followed by appropriate parton showers, as well as by the colour dipole model. The HERWIG parton showermodel also gives a reasonable representation of the data. Neither the first order matrix elements alone nor the Lund parton showermodel, without the matrix element calculation, reproduce the data.