Abstract
Results are presented from a study of the structure of hadronic events in high-energy e+e- interactions detected by the L3 detector at LEP. Various event shape distributions and their moments are measured at several energy points at and above the Z-boson mass. The event flavour is tagged by using the decay characteristics of b-hadrons. Measurements of distributions of event shape variables for all hadronic events, for light (u, d, s, c) and heavy (b) quark flavours are compared to several QCD models with improved leading log approximation: JETSET, HERWIG and ARIADNE. A good description of the data is provided by the models.
Highlights
Hadronic events produced in e+e- annihilation have been a powerful tool to test the predictions of Quantum Chromodynamics (QCD) [1,2,3,4,5]
Perturbative QCD successfully accounts for many aspects of the hadronic decays of the Z boson [6]
Instead several phenomenological models have been developed to describe fragmentation. These models provide a way to correct for the effects of fragmentation in the experimental data, which can be compared with the perturbative QCD calculations directly
Summary
Hadronic events produced in e+e- annihilation have been a powerful tool to test the predictions of Quantum Chromodynamics (QCD) [1,2,3,4,5]. Instead several phenomenological models have been developed to describe fragmentation These models provide a way to correct for the effects of fragmentation in the experimental data, which can be compared with the perturbative QCD calculations directly. The event shape variables which characterize the global structure of hadronic events are among the simplest experimental measurements sensitive to the parameters of perturbative QCD and fragmentation models. Hadronic events are separated into heavy (b) and light (u, d, s, c) flavours, and event shape variables are separately measured for these final states. This allows to test the modelling of heavy flavour mass effects. At lower centre-of-mass energies, are reported in References [11] and [16]
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