Quantum-chromodynamics perturbation expansions in a coupling constant renormalized by momentum-space subtraction

We relate two popular methods of renormalization; minimal subtraction and momentum-space subtraction. It is shown that Λ/sub mom//Λ/sub min/ = 5.73, where Λ is the mass used to parametrize the quantum-chromodynamic running coupling constant. Perturbation expansions are compared in the two methods. Our results support the conjecture that momentum-space subtraction leads to better convergence and that, therefore, Λ/sub mom/ is the parameter which should be measured by experiments