Author/Authors :
ZEUS Collaboration، نويسنده , , Valeri S. Chekanov، نويسنده , , M. Derrick، نويسنده , , S. Magill، نويسنده , , S. Miglioranzi، نويسنده , , B. Musgrave، نويسنده , , D. Nicholass، نويسنده , , J. Repond، نويسنده , , R. Yoshida، نويسنده , , M.C.K. Mattingly، نويسنده , , N. Pavel، نويسنده , , A.G. Yagües Molina، نويسنده , , Mary Ann S. Antonelli، نويسنده , , P. Antonioli، نويسنده , , G. Bari، نويسنده , , M. Basile، نويسنده , , L. Bellagamba، نويسنده , , A. GIUNTOLI and M. BINDI، نويسنده , , D. Boscherini، نويسنده , , C. B. Vicentini and A. Bruni، نويسنده , , et al.، نويسنده ,
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 image and image, where image 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 image and of the non-perturbative parameter of the model, image, suggests the importance of higher-order processes that are not yet included in the model.
