Title:
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Extraction of αs from radiative Υ(1S) decays
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Author:
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Brambilla, Nora; Garcia i Tormo, Xavier; Soto Riera, Joan; Vairo, Antonio
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Other authors:
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Universitat de Barcelona |
Abstract:
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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):
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-Física de partícules -Cromodinàmica quàntica -Particle physics -Quantum chromodynamics |
Rights:
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(c) American Physical Society, 2007
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Document type:
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Article Article - Published version |
Published by:
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American Physical Society
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