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


Frederix, R; Frixione, S; Melnikov, K; Zanderighi, G (2010). NLO QCD corrections to five-jet production at LEP and the extraction of αs(MZ). Journal of High Energy Physics, (11):050.

Abstract

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 {α_s}left( {{M_Z}} right) = 0.1156_{ - 0.0034}^{ + 0.0041} can be extracted from the distribution of the five-jet resolution parameter and the five-jet rate at LEP1 and LEP2.

Abstract

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 {α_s}left( {{M_Z}} right) = 0.1156_{ - 0.0034}^{ + 0.0041} can be extracted from the distribution of the five-jet resolution parameter and the five-jet rate at LEP1 and LEP2.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:November 2010
Deposited On:02 Mar 2011 10:44
Last Modified:05 Apr 2016 14:33
Publisher:Springer
ISSN:1029-8479
Publisher DOI:https://doi.org/10.1007/JHEP11(2010)050
Related URLs:http://arxiv.org/abs/1008.5313

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Download PDF  'NLO QCD corrections to five-jet production at LEP and the extraction of αs(MZ) '.
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Content: Accepted Version
Filetype: PDF (Accepted manuscript, Version 1)
Size: 303kB