Abstract
In the process e +e −→hadrons, one of the effects of gluon emission is to modify the (1+cos 2 θ) form of the angular distribution of the thrust axis, an effect which may be quantified by the longitudinal cross-section. Using the OPAL detector at LEP, we have determined the longitudinal to total cross-section ratio to be σ L/ σ tot=0.0127±0.0016±0.0013 at the parton level, in good agreement with the expectation of QCD computed to O(α s 2) . Comparisons at the hadron level with Monte Carlo models are presented. The dependence of the longitudinal cross-section on the value of thrust has also been studied, and provides a new test of QCD.
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