TL;DR
This paper presents recent LEP e+e- annihilation data analysis for QCD, measuring alpha_s, exploring energy evolution, non-perturbative effects, and QCD color factors with high precision.
Contribution
It provides new precise measurements of alpha_s, 4-jet rates, and QCD color factors from LEP data, enhancing understanding of QCD at high energies.
Findings
Precise alpha_s measurements from event-shape variables.
High-accuracy determination of 4-jet rates.
QCD color factors consistent with theoretical predictions.
Abstract
Recent results on QCD studies in e+e- annihilations at LEP are presented. Data recorded by the LEP experiments at centre-of-mass energies between 91.2 to 206 GeV are included. The main topic is the measurement of alpha_s from event-shape variables and associated aspects like the energy evolution or non-perturbative power-law corrections. These 'standard' measurements are complemented by new determinations using the 4-jet rate with an excellent precision. A summary of the results on QCD colour factors from angular correlations in the 4-jet system completes this report.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Dark Matter and Cosmic Phenomena