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

TL;DR

This paper analyzes hadronic event shapes in electron-positron collisions at 197 GeV, comparing measurements for different quark flavors to QCD models, and finds good agreement with the models' predictions.

Contribution

It provides detailed measurements of event shape distributions for various quark flavors at high energies and compares them to multiple QCD models, enhancing understanding of hadronic event structures.

Findings

QCD models accurately describe the data

Event shape distributions vary with quark flavor

Measurements extend to energies above the Z-boson mass

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.