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1. Shown below are experimental measurements of the QCD coupling constant, as(q?) versus four-momentum scale lql. 0.5 Tau decay 0.4 Heavy quarkonia Deep inelastic scattering

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1. Shown below are experimental measurements of the QCD coupling constant, as(q?) versus four-momentum scale lql. 0.5 Tau decay 0.4 Heavy quarkonia Deep inelastic scattering . ete Annihilation 0.3 as(q2) 0.2 0.1 LLULL 10 102 (Alt + A) (a) Four types of experimental data are given in the plot. Discuss the advantages of each for measuring the coupling constant. Give the most relevant Feynman diagrams for each

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