Abstract

We present some of the OPAL QCD results at √s = 172 GeV , event shape variables, charged particle spectra and multiplicities. We determine the strong coupling strength to be α s(172 GeV) = 0.093±0.005( stat.)±0.006( sys.) , the mean charged multiplicity to be 〈η ch 〉(172 GeV) = 25.92±0.56( stat.)±0.81( sys.) and the position of the peak in the ξ p = ln( 1 x p ) distribution to be ξ 0(172 GeV) = 4.02±0.04( stat.)±0.02( sys.) . The results are compared with data taken at lower centre-of mass energies and analytic QCD and Monte Carlo predictions.

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