The transition from weak to strong coupling in quantum chromodynamics is discussed using semiclassical methods to calculate the effective coupling g(a) of an effective lattice theory as a function of a. We demonstrate that the renormalization effects due to instantons cause a sharp transition from weak to strong coupling in the range g(a)1.5-3. This is verified by showing that the "string tension" as well as the function calculated by semiclassical methods match their strong-coupling behavior for g1.5-3. An independent test of this notion is provided by a bag-model calculation of the string tension.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)