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