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Photo of Rikkert Frederix

Rikkert Frederix

Senior lecturer

Photo of Rikkert Frederix

NLO QCD corrections to five-jet production at LEP and the extraction of α s(M Z)

Author

  • Rikkert Frederix
  • Stefano Frixione
  • Kirill Melnikov
  • Giulia Zanderighi

Summary, in English

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 highmultiplicity jet final states with parton showers. We show that a competitive value of the strong coupling constant α s(M Z) = 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.

Publishing year

2010-11

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2010

Issue

11

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Jets
  • LEP HERA and SLC Physics
  • NLO Computations
  • QCD

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479