We improve on a recent determination of alpha_s from Gamma(Upsilon(1S)-->X gamma)/Gamma(Upsilon(1S)-->X) with CLEO data by taking into account color octet contributions and avoiding any model dependence in the extraction. We obtain alpha_s(M_Upsilon(1S))= 0.184+0.014-0.013, which corresponds to alpha_s(M_Z)=0.119+0.006-0.005.
Extraction of alpha(s) from radiative Upsilon(1S) decays / Nora Brambilla, Xavier Garcia, J. Soto, A. Vairo. - In: PHYSICAL REVIEW D. - ISSN 0556-2821. - 75:7(2007), pp. 074014.74014-1-074014.74014-5.
Extraction of alpha(s) from radiative Upsilon(1S) decays
Nora Brambilla;A. VairoUltimo
2007
Abstract
We improve on a recent determination of alpha_s from Gamma(Upsilon(1S)-->X gamma)/Gamma(Upsilon(1S)-->X) with CLEO data by taking into account color octet contributions and avoiding any model dependence in the extraction. We obtain alpha_s(M_Upsilon(1S))= 0.184+0.014-0.013, which corresponds to alpha_s(M_Z)=0.119+0.006-0.005.
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