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A discussion of the modified minimal-subtraction (-MS) prescription in QCD is presented. Effects of flavor thresholds on αₛ(μ) and Λ_-MS are examined. Two parametrization options are described. In the first approach, distinct mass scales Λ_-MS^(NF) associated with NF, the effective number of flavors, are introduced. In the second scheme, a standard NF-independent Λ_-MS is adopted but the functional form of α(μ) is slightly modified.
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William J. Marciano (1984) studied this question.
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