TL;DR
This paper reviews recent LEP QCD results, highlighting precise measurements of gluon jets, evidence of color coherence, and unexplained discrepancies between theory and experiment in photon-photon collisions and b-quark production.
Contribution
It presents the most precise measurements of gluon jets, evidence for color coherence, and discusses unresolved disagreements in QCD predictions versus experimental data at LEP.
Findings
Most precise measurement of unbiased gluon jets
Strong evidence of color coherence in 3-jet events
Unexplained disagreements in photon-photon collisions and b-quark production
Abstract
I review recent QCD results from LEP. The emphasis is on results that represent new studies and on puzzling disagreements of theory and experiment. Further results are nevertheless mentioned by reference. The new studies discussed in more detail are the most precise measurement of unbiased gluon jets to date, strong evidence of color coherence in 3-jet events, and an, albeit unsuccessful, search for penta-quarks. As yet unexplained disagreements are observed in photon-photon collisions for high momentum charged particle and single jet production, and for the total cross section of b-quark production.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research