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Study of hadronic event shape in flavour tagged events in e+e- annihilation at s = 197 GeV

Salvatore Mele12* and the L3 Collaboration1

Author Affiliations

1 European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland

2 INFN-Sezione di Napoli and University of Naples, I-80125 Naples, Italy

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PMC Physics A 2008, 2:6  doi:10.1186/1754-0410-2-6

Published: 8 December 2008


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.

PACS Codes: 12.38.Qk, 13.66.Bc