Report/Journal Article PUBDB-2017-07284

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Determination of $\alpha_s$ using jet rates at LEP with the OPAL detector

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2006
Springer Berlin

The European physical journal / C 45(3), 547 - 568 () [10.1140/epjc/s2005-02417-4]
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Report No.: CERN-PH-EP-2005-024; hep-ex/0507047

Abstract: Hadronic events produced in e+e- collisions by the LEP collider and recorded by the OPAL detector were used to form distributions based on the number of reconstructed jets. The data were collected between 1995 and 2000 and correspond to energies of 91 GeV, 130-136 GeV and 161-209 GeV. The jet rates were determined using four different jet-finding algorithms (Cone, JADE, Durham and Cambridge). The differential two-jet rate and the average jet rate with the Durham and Cambridge algorithms were used to measure alpha(s) in the LEP energy range by fitting an expression in which order alpah_2s calculations were matched to a NLLA prediction and fitted to the data. Combining the measurements at different centre-of-mass energies, the value of alpha_s (Mz) was determined to be alpha(s)(Mz)=0.1177+-0.0006(stat.)+-0.0012$(expt.)+-0.0010(had.)+-0.0032(theo.) \.

Keyword(s): electron positron: colliding beams ; electron positron: annihilation ; jet: electroproduction ; hadron: multiple production ; jet: multiplicity ; jet: particle identification ; strong interaction: coupling constant ; energy dependence ; quantum chromodynamics: perturbation theory ; ALEPH ; experimental results ; CERN LEP Stor ; 91: 130-136: 161-209 GeV-cms

Classification:

Note: Forschung an Lepton Collidern

Contributing Institute(s):
  1. DESY Retrocat (DESY(-2012))
Research Program(s):
  1. 899 - ohne Topic (POF3-899) (POF3-899)
Experiment(s):
  1. No specific instrument

Database coverage:
Medline ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NationallizenzNationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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 Record created 2017-07-10, last modified 2025-07-31


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