QCD results from studies of hadronic events produced in e+ e- annihilations at S**(1/2) = 183-GeV

We present results obtained from a study of the structure of hadronic events recorded by the L3 detector at a centre-of-mass energy of 183 GeV. The data sample corresponds to an integrated luminosity of 55.3 pb −1 . The distributions of event shape variables and the energy dependence of their mean values are measured. From a comparison with resummed O ( α s 2 ) QCD calculations, we determine the strong coupling constant α s (183 GeV )=0.1086 ± 0.0026 (exp) ± 0.0054 (th) . The charged particle multiplicity distribution and momentum spectrum are studied and the energy dependence of the peak position of the ξ (=−ln x p ) distribution is compared with lower energy measurements and QCD expectations.

electron positron: colliding beams
electron positron: annihilation
hadron: multiple production
event shape analysis
energy dependence
quantum chromodynamics: perturbation theory
showers: parton
strong interaction: coupling constant
charged particle: multiplicity
charged particle: momentum spectrum

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