Measurement of the Strong Coupling alpha s from Four-Jet Observables in e+e- Annihilation
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ex/0601048,
title = {Measurement of the Strong Coupling alpha s from Four-Jet Observables in e+e- Annihilation},
author = {The OPAL Collaboration and G. Abbiendi},
journal= {arXiv preprint arXiv:hep-ex/0601048},
year = {2009}
}
Comments
25 pages, 15 figures, Submitted to Euro. Phys. J. C