Event Shapes and Power Correction Results from HERA
Abstract
Inclusive event shape variables have been measured in the Breit Frame for neutral current deep-inelastic positron-proton scattering using the H1 and ZEUS detectors at HERA. The variables thrust, jet broadening, C-parameter, jet mass and two kinds of differential two-jet rate have been studied in the kinematic range 7 < Q < 100 GeV. The Q dependence of the shape variables have been compared with QCD applying power corrections proportional to 1/Qp to account for hadronisation effects. The concept of power corrections is tested by fitting the strong coupling constant alphas and a non-perturbative parameter alpha(p-1)bar.
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