Scaled momentum distributions for the strange hadrons K0s and Lambda/bar Lambda were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb-1. The evolution of these distributions with the photon virtuality, Q2, was studied in the kinematic region 10
The measured scaled momentum distributions for K0S production as a function of Q^2 in six XP regions.
The measured scaled momentum distributions for K0S production as a function of XP in five Q**2 regions.
The measured scaled momentum distributions for K0S production as a function of XP in two Q^2 regions.
The scaled momentum distributions of charged particles in jets have been measured for dijet photoproduction with the ZEUS detector at HERA using an integrated luminosity of 359 pb-1. The distributions are compared to predictions based on perturbative QCD carried out in the framework of the modified leading-logarithmic approximation (MLLA) and assuming local parton-hadron duality (LPHD). The universal MLLA scale, Lambda_eff, and the LPHD parameter, kappa^ch, are extracted.
Distribution of multiplicity of charged particles in a jet as a function of LN(1/X) for mean jet energy 19 GeV and jet cone opening angle 0.23.
Distribution of multiplicity of charged particles in a jet as a function of LN(1/X) for mean jet energy 23 GeV and jet cone opening angle 0.23.
Distribution of multiplicity of charged particles in a jet as a function of LN(1/X) for mean jet energy 28 GeV and jet cone opening angle 0.23.
The large amount of data accumulated by the TASSO detector at 35 GeV c.m. energy has been compared with the predictions of the latest generation of perturbative QCD+fragmentation models. By adjustment of the arbitrary parameters of these models, a very good description of the global properties of hadronic events was obtained. No one model gave the best description of all features of the data, each model being better than the others for some observables and worse in other quantities. We interpret these results in terms of the underlying QCD and hadronisation schemes. The trends of the data across the energy range 12.0≦W≦41.5 GeV are generally well reproduced by the models with the parameters optimised at 35 GeV.
The errors include the statistical error and that from the correction procedure.
The errors include the statistical error and that from the correction procedure.
The errors include the statistical error and that from the correction procedure.
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