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NLO QCD corrections to five-jet production at LEP and the extraction of alpha_s(M_Z)

The highest exclusive jet multiplicity studied at LEP experiments is five. In this paper we compute the next-to-leading order QCD corrections to e+e- annihilation to five jets, essentially closing the (pure) perturbative QCD studies of exclusive jetty final states at LEP. We compare fixed-order perturbative results with ALEPH data. We estimate hadronization corrections to five-jet observables using the event generator SHERPA, which employs the CKKW procedure to combine a reliable perturbative treatment of high-multiplicity jet final states with parton showers. We show that a competitive value of the strong coupling constant alpha_s(M_Z) = 0.1156 +0.0041 -0.0034 can be extracted from the distribution of the five-jet resolution parameter and the five-jet rate at LEP1 and LEP2.

preprint2010arXivOpen access
Rikkert FrederixStefano FrixioneKirill MelnikovGiulia Zanderighi
hep-ph
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Rikkert FrederixStefano FrixioneKirill MelnikovGiulia Zanderighi

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