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T: Teilchenphysik

T 403: QCD IV

T 403.3: Talk

Thursday, March 20, 1997, 14:40–14:55, 101

Extracting α_s from Electron-Positron Annihilation around 10 GeV — •Thomas Teubner¹, K.G. Chetyrkin², and J.H. Kühn³ — ¹University of Durham, England — ²Max-Planck-Institut für Physik, München — ³Institut für Theoretische Teilchenphysik, Universität Karlsruhe

The total cross section for electron-positron annihilation into hadrons is calculated in the region just below the B meson threshold. QCD corrections up to third order, quark mass effects, initial state radiation, the running of α_QED and the tails of the Upsilon resonances are included in the prediction. For given α_s the prediction is accurate to 0.5 percent. An experimental measurement with the corresponding precision would allow to determine α_s with high accuracy at intermediate energies.