Extraction of αs from radiative Υ(1S) decays

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Title:	Extraction of αs from radiative Υ(1S) decays
Author:	Brambilla, Nora; Garcia i Tormo, Xavier; Soto Riera, Joan; Vairo, Antonio
Other authors:	Universitat de Barcelona
Abstract:	We improve on a recent determination of α s from Γ ( Υ ( 1 S ) → γ X ) / Γ ( Υ ( 1 S ) → X ) with CLEO data by taking into account color octet contributions and avoiding any model dependence in the extraction. We obtain α s ( M Υ ( 1 S ) ) = 0.184 + 0.015 − 0.014 , which corresponds to α s ( M Z ) = 0.119 + 0.006 − 0.005 .
Subject(s):	-Física de partícules -Cromodinàmica quàntica -Particle physics -Quantum chromodynamics
Rights:	(c) American Physical Society, 2007
Document type:	Article Article - Published version
Published by:	American Physical Society
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