arXiv:hep-ph/0702079·v3·High Energy Physics — Phenomenology
Extraction of alpha_s from radiative Upsilon(1S) decays
Nora Brambilla🇮🇹 · Xavier Garcia i Tormo🇺🇸 · Joan Soto🇪🇸 · Antonio Vairo🇮🇹
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+0.015-0.014, which corresponds to alpha_s(M_Z)=0.119+0.006-0.005.
Comments: 11 pages. v2: One reference added. v3: Minor modification in an error estimate. Journal version