| Submitted to Eur. Phys. J. C (2009) | |||||||||||||
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Abstract | |||||||||||||
| Abstract Deep-inelastic ep scattering data taken with the H1 detector at HERA and correspondingto an integrated luminosity of 106 pb-1 are used to study the differential distributions ofevent shape variables. These include thrust, jet broadening, jet mass and the C-parameter.The four-momentum transfer Q is taken to be the relevant energy scale and ranges between 14 GeV and 200 GeV. The event shape distributions are compared with perturbative QCDpredictions, which include resummed contributions and analytical power law corrections, the latter accounting for non-perturbative hadronisation effects. The data clearly exhibit therunning of the strong coupling ffs(Q) and are consistent with a universal power correctionparameter ff0 for all event shape variables. A combined QCD fit using all event shapevariables yields | |||||||||||||
Details der Publikation | |||||||||||||
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