QCD studies with e+e- annihilation data at 172-189 GeV
摘要
We have studied hadronic events from 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 <nch> 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, <nch> and xi_0 are consistent with previous determinations at sqrt{s}=MZ.
关键词
引用
@article{arxiv.hep-ex/0002012,
title = {QCD studies with e+e- annihilation data at 172-189 GeV},
author = {The OPAL collaboration and G Abbiendi},
journal= {arXiv preprint arXiv:hep-ex/0002012},
year = {2008}
}
备注
49 pages, 13 figures, submitted to Eur. Phys. J. C