Abstract.
We have studied hadronic events from \(\mathrm{e^+e^-}\) annihilation data at centre-of-mass energies of \(\sqrt{s}=\)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 \(\alpha_s \), the mean charged particle multiplicity \(\langle n_{\mathrm{ch}}\rangle\) and the peak position \(\xi_0\) in the \(\xi_p=\ln(1/x_p)\) distribution. In general the data are described well by analytic QCD calculations and Monte Carlo models. Our measured values of \(\alpha_s \), \(\langle n_{\mathrm{ch}}\rangle\) and \(\xi_0\) are consistent with previous determinations at \(\sqrt{s}=M_{\mathrm{Z^0}}\).
Similar content being viewed by others
Author information
Authors and Affiliations
Consortia
Additional information
Received: 17 December 1999 / Published online: 18 May 2000
Rights and permissions
About this article
Cite this article
The OPAL Collaboration., Abbiendi et al., G. QCD studies with \({\rm e^+e^-}\) annihilation data at 172-189 GeV. Eur. Phys. J. C 16, 185–210 (2000). https://doi.org/10.1007/s100520050015
Issue Date:
DOI: https://doi.org/10.1007/s100520050015