Study of moments of event shapes and a determination of as using epem annihilation data from Jade - High Energy Physics - ExperimentReport as inadecuate




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Abstract: Data from \epem annihilation into hadrons, collected by the \Jade experimentat centre-of-mass energies between 14 GeV and 44 GeV, are used to study momentsof event shape distributions. Models with hadronisation parameters tuned to theLEP 1 precision data provide an adequate description of the low energy datastudied here. The NLO QCD calculations, however, show systematic deficienciesfor some of the moments. The strong coupling measured from the moments whichare reasonably described by NLO QCD,\asmz=0.1287\pm0.0007\stat\pm0.0011\expt\pm0.0022\had\pm0.0075\theo isconsistent with the world average.



Author: Christoph Pahl, Siegfried Bethke, Stefan Kluth, Jochen Schieck, for the JADE collaboration

Source: https://arxiv.org/



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