New QCD tests with old JADE data

Details New QCD tests with old JADE data New QCD tests with old JADE data

2005-05-12

arxiv.org/abs/hep-ex/0505026v1

Physics

High Energy Physics

High Energy Physics - Experiment

to appear in proceedings of XXXXth Rencontres de Moriond, "QCD and High Energy Hadronic Interactions", La Thuile, Italy, March

Scientific paper

Data from e+e- annihilation into hadrons collected by the JADE experiment at centre-of-mass energies between 14 and 44 GeV were used to study the 4-jet rate using the Durham algorithm as well as the first five moments of event shape observables. The data were compared with NLO QCD predictions, augmented by resummed NLLA calculations for the 4-jet rate, in order to extract values of the strong coupling constant alpha_S. The preliminary results are alpha_S(M_Z) = 0.1169 +/- 0.0026 (4-jet rate) and alpha_S(M_Z) = 0.1286 +/- 0.0072 (moments) consistent with the world average value. For some of the higher moments systematic deficiencies of the QCD predictions are observed.

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