Extraction of alpha_s from radiative Upsilon(1S) decays

Details Extraction of alpha_s from radiative Upsilon(1S) decays Extraction of alpha_s from radiative Upsilon(1S) decays

2007-02-07

arxiv.org/abs/hep-ph/0702079v3

Phys.Rev.D75:074014,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages. v2: One reference added. v3: Minor modification in an error estimate. Journal version

Scientific paper

10.1103/PhysRevD.75.074014

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.

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