Energy Dependence Of Event Shapes And Of Alpha(S) At Lep 2

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Physics Letters B（1999）

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摘要

Infrared and collinear safe event shape distributions and their mean values are determined using the data taken at five different centre of mass energies above M-Z with the DELPHI detector at LEP. From the event shapes, the strong coupling alpha(s) is extracted in O(alpha(s)(2)), NLLA and a combined scheme using hadronisation corrections evaluated with fragmentation model generators as well as using an analytical power ansatz. Comparing these measurements to those obtained at M-Z, the energy dependence (running) of alpha(s) is accessible. The logarithmic energy slope of the inverse strong coupling is measured to bed alpha(s)(-1)/d log(E-cm) = 1.39 +/- 0.34 (stat) +/- 0.17(syst),in good agreement with the QCD expectation of 1.27. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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predictions,monte carlo,fragmentation

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