QCD studies with e+e- annihilation data at 172-189 GeV
The OPAL collaboration, G Abbiendi
Abstract
We have studied hadronic events from e+e- annihilation data at centre-of-mass energies of sqrts=172, 183 and 189 GeV. The total integrated luminosity of the three samples, measured with the OPAL detector, corresponds to 250 pb-1. We present distributions of event shape variables, charged particle multiplicity and momentum, measured separately in the three data samples. From these we extract measurements of the strong coupling alphas, the mean charged particle multiplicity <nch> and the peak position xi0 in the xip=ln(1/xp) distribution. In general the data are described well by analytic QCD calculations and Monte Carlo models. Our measured values of alphas, <nch> and xi0 are consistent with previous determinations at sqrts=MZ.
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