Search results for "STRONG-COUPLING-CONSTANT"

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Energy-energy correlations in hadronic final states from Z0 decays

1990

We have studied the energy-energy angular correlations in hadronic final states from Z0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ(5)/MS = 104-20 +25 (stat.)-20 +25(syst.)-00 +30(theor.) MeV, which corresponds to αs(91 GeV) = 0.106± 0.003 (stat.)±0.003(syst.)-0.000 +0.003(theor.). The theoretical error stems from different choices for the renormalization scale of αs. In the Monte Carlo simulation the scale of αs as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.

Nuclear and High Energy PhysicsParticle physicsLUND MONTE-CARLO2ND ORDER QCDElectron–positron annihilationHadronMonte Carlo methodElementary particleSTRONG-COUPLING-CONSTANT; ELECTRON-POSITRON ANNIHILATION; LUND MONTE-CARLO; FREE PERTURBATION-THEORY; 2ND ORDER QCD; E+E-ANNIHILATION; QUANTUM CHROMODYNAMICS; ALPHA-S; FRAGMENTATION MODELS; JET FRAGMENTATIONFRAGMENTATION MODELS01 natural sciencesJET FRAGMENTATIONNuclear physicsParticle decay0103 physical sciencesSTRONG-COUPLING-CONSTANTALPHA-S010306 general physicsNuclear ExperimentELECTRON-POSITRON ANNIHILATIONQuantum chromodynamicsCoupling constantPhysicsQUANTUM CHROMODYNAMICSAnnihilation010308 nuclear & particles physicsE+E-ANNIHILATIONFREE PERTURBATION-THEORYPhysique des particules élémentairesFísica nuclearHigh Energy Physics::ExperimentParticle Physics - Experiment
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