Measurement of event shapes in deep inelastic scattering at HERA

Inclusive event-shape variables have been measured in the current region of the Breit frame for neutral current deep inelastic ep scattering using an integrated luminosity of 45.0 pb^-1 collected with the ZEUS detector at HERA. The variables studied included thrust, jet broadening and invariant jet mass. The kinematic range covered was 10 < Q^2 < 20,480 GeV^2 and 6.10^-4 < x < 0.6, where Q^2 is the virtuality of the exchanged boson and x is the Bjorken variable. The Q dependence of the shape variables has been used in conjunction with NLO perturbative calculations and the Dokshitzer-Webber non-perturbative corrections (`power corrections') to investigate the validity of this approach.

Note:

7+25 pages, 6 figures Report-no: DESY-02-198

positron p: colliding beams
positron p: deep inelastic scattering
neutral current
jet: electroproduction
event shape analysis
momentum transfer dependence
x-dependence
quantum chromodynamics: perturbation theory
correction: nonperturbative
strong interaction: coupling constant

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