Abstract
We study a gauge-independent formulation for the effective mass of quark based on the momentum subtraction renormalization condition. To this end a gauge-independent quark propagator is introduced, and with the aid of the resulting mass anomalous dimension, we can discuss the threshold effects in a gauge-independent manner. As an example we find an earlier computation of the top quark mass is modified. We find 2 M t =51±1 GeV.
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