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Determination of αs from hadronic event shapes in e+e annihilation at 192≤√s≤208 GeV

CollaborationWith : Achard, Pablo / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Echenard, Bertrand / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Malgeri, Luca / Natale, Sonia / Pohl, Martin
Published in Physics Letters. B. 2002, vol. 536, no. 3-4, p. 217-228
Abstract Results are presented from a study of the structure of high energy hadronic events recorded by the L3 detector at √s≥192 GeV. The distributions of several event shape variables are compared to resumed O(αs2)QCD calculations. We determine the strong coupling constant at three average centre-of-mass energies: 194.4, 200.2 and 206.2 GeV. These measurements, combined with previous L3 measurements at lower energies, demonstrate the running of αs as expected in QCD and yield αs(mZ)=0.1227±0.0012±0.0058, where the first uncertainty is experimental and the second is theoretical.
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L3 COLLABORATION. Determination of αs from hadronic event shapes in e+e annihilation at 192≤√s≤208 GeV. In: Physics Letters. B, 2002, vol. 536, n° 3-4, p. 217-228. https://archive-ouverte.unige.ch/unige:43050

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Deposited on : 2014-12-11

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