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Title: Jet Physics at LEP and World Summary of $α_s$

Authors: S. Bethke (III. Phys. Inst., RWTH Aachen, Germany)
Abstract: Recent results on jet physics and tests of QCD from hadronic final states in $e^+e^-$ annihilation at PETRA and at LEP are reviewed, with special emphasis on hadronic event shapes, charged particle production rates, properties of quark and gluon jets and determinations of $\alpha_s$. The data in the entire energy range from PETRA to LEP-2 are in broad agreement with the QCD predictions. The world summary of measurements of $\alpha_s$ is updated and a detailed discussion of various methods to determine the overall error of $\alpha_s (M_Z)$ is presented. The new world average is $\alpha_s (M_Z) = 0.119 \pm 0.004$. The size of the error depends on the treatment of correlated uncertainties.
 Comments: Talk presented at the $IV^{th}$ Int. Symp. on Radiative Corrections, Barcelona, Sept. 8-12, 1998. 18 pages, 13 eps-figures; uses sprocl.sty and psfig.sty Subjects: High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph) Cite as: arXiv:hep-ex/9812026 (or arXiv:hep-ex/9812026v1 for this version)

Submission history

From: Siggi Bethke [view email]
[v1] Mon, 21 Dec 1998 16:38:23 GMT (307kb)