In addition, current quarks possess one asymptotic freedom within the limits described by perturbation theory.
The local term plays no more role for the description of the hadrons with the light current quarks[clarification needed].
The current quark mass is a logical consequence of the mathematical formalism of the quantum field theory (QFT), so the idea does not arise from a strictly descriptive report of observations.
The current quark mass is a parameter to compute sufficiently small color charges.
[b] The comparison of the results of the computations with the experimental data supplies the values for the current quark masses.