Publication Date:
2007
Citation:
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.
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.
IRIS type:
01 - Articolo su periodico
Keywords:
Precision determination of Standard Model Parameters ; Particle physics ; Heavy Quarks ;
High order perturbative calculations
List of contributors:
Nora Brambilla, Xavier Garcia, J. Soto, A. Vairo
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