Measurement of the Strong Coupling alpha(s) from four-jet observables in e+ e- annihilation

Data from e+e- annihilation into hadrons at centre-of-mass energies between 91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study the four-jet rate as a function of the Durham algorithm resolution parameter ycut. The four-jet rate is compared to next-to-leading order calculations that include the resummation of large logarithms. The strong coupling measured from the four-jet rate is alphas(Mz0)= 0.1182+-0.0003(stat.)+-0.0015(exp.)+-0.0011(had.)+-0.0012(scale)+-0.0013(mass) in agreement with the world average. Next-to-leading order fits to the D-parameter and thrust minor event-shape observables are also performed for the first time. We find consistent results, but with significantly larger theoretical uncertainties.

electron positron: colliding beams
electron positron: annihilation
jet: electroproduction
final state: (4jet)
hadron: multiple production
energy dependence
event shape analysis
quantum chromodynamics: perturbation theory
strong interaction: coupling constant
OPAL

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