Mean values and differential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated luminosity of 82.2 pb−1 collected with the ZEUS detector at HERA. The kinematic range is and 0.0024<x<0.6, where Q2 is the virtuality of the exchanged boson and x is the Bjorken variable. The data are compared with a model based on a combination of next-to-leading-order QCD calculations with next-to-leading-logarithm corrections and the Dokshitzer–Webber non-perturbative power corrections. The power-correction method provides a reasonable description of the data for all event-shape variables studied. Nevertheless, the lack of consistency of the determination of αs and of the non-perturbative parameter of the model, , suggests the importance of higher-order processes that are not yet included in the model.
Event shapes in deep inelastic scattering at HERA.
MONACO, Vincenzo;SACCHI, Roberto;SOLANO, Ada Maria;
2007-01-01
Abstract
Mean values and differential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated luminosity of 82.2 pb−1 collected with the ZEUS detector at HERA. The kinematic range is and 0.0024File | Dimensione | Formato | |
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