Abstract
All the published data on quark pair final states in the continuum ine+e− annihilation have been analysed in a self consistent way to study the behaviour of the strong coupling constant, αS and the associated scale parameter\(\Lambda _{\overline {MS} }^{(4)} \). The best fit results are αS = 0.135±0.012±0.010 ats=Q2=1000 GeV2 or from an alternative fit, |αS| = 0.137±0.015±0.010. The value of sin2θw obtained simultaneously is 0.236±0.015. These fits provide a good description of theR continuum fromQ2=7 GeV2 all the way through two distinct quark thresholds toQ2=2704 GeV2. By including terms up to 3rd order in αS it is shown that these 3rd order terms have a considerable effect and that 4th order corrections may be needed.
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