Measurement of event shape variables in deep inelastic e p scattering
1997
Abstract Deep inelastic e p scattering data, taken with the H1 detector at
HERA, are used to study the event shape variables thrust, jet broadening and jet mass in the current hemisphere of the Breit frame over a large range of momentum transfers Q between 7 GeV and 100 GeV. The data are compared with results from e + e − experiments. Using second order QCD calculations and an approach to relate hadronisation effects to power corrections an analysis of the Q dependences of the means of the event
shape parametersis presented, from which both the power corrections and the strong coupling constant are determined without any assumption on fragmentation models. The power corrections of all event shape variables investigated follow a 1/ Q behaviour and can be described by a common parameter α 0 .
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