Particle spectra at ZEUS

Charged multiplicity distributions and the mean charged multiplicity have been investigated in inclusive neutral current deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-1. The measurements were performed in the current region of the Breit frame,...

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Bibliographic Details
Published in:arXiv.org 2009-11
Main Authors: Shcheglova, Lydia, the ZEUS Collaboration
Format: Article
Language:English
Subjects:
Charged particles
Dependence
Inelastic scattering
Luminosity
Neutral currents
Photoproduction
Online Access:Get full text
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Summary:Charged multiplicity distributions and the mean charged multiplicity have been investigated in inclusive neutral current deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-1. The measurements were performed in the current region of the Breit frame, as well as in the current fragmentation region of the hadronic center-of-mass frame. The KNO-scaling properties of the data were investigated and the energy dependence of multiplicity distributions was studied using different energy scales. The data are compared to results obtained in e+e- collisions and to previous DIS measurements as well as to leading-logarithm parton-shower Monte Carlo predictions. The scaled momentum distributions of charged particles in jets have been also 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.
ISSN:2331-8422