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The magnitude of the strong interaction is characterized by $\alpha_s$, thecoupling parameter in Quantum Chromodynamics (QCD), a parameter with anunexplained value in the Standard Model. In this paper, a candidate explanationfor $\alpha_s$ is derived from (1) the lifetime of quark-antiquark pairs invacuum fluctuations given by the Uncertainty Principle, (2) the variation of$\alpha_s$ as a function of energy in QCD, and (3) classical relativisticdynamics of the quarks and antiquarks. A semiclassical model for heavyquark-antiquark vacuum fluctuations is described herein, based on (2) and (3).The model in this paper predicts the measured value of $\alpha_s(M_{Z^0})$ tobe 0.121, which is in agreement with recent measurements within statisticaluncertainties.

The QCD Coupling Parameter Derived from the Uncertainty Principle and a Model for Quark Vacuum Fluctuations