Investigation of power corrections to event shape variables measured in deep inelastic scattering

Deep-inelastic ep scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening, jet mass, C parameter and two kinds of differential two-jet rate. The data cover a large range of the four-momentum transfer Q, which is considered to be the relevant energy scale, between 7 GeV and 100 GeV. The Q dependences of the mean values are compared with second order calculations of perturbative QCD applying power law corrections proportional to 1/Q^p to account for hadronization effects. The concept of power corrections is investigated by fitting simultaneously a non-perturbative parameter alpha_p and the strong coupling constant alpha_s.

Note:

27 pages, 9 figures, 3 tables Report-no: DESY 99-193

positron p: colliding beams
positron p: deep inelastic scattering
jet: electroproduction
hadron: multiple production
event shape analysis
kinematics: Breit frame
momentum transfer dependence
quantum chromodynamics: perturbation theory
correction: hadronization
parametrization

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