Abstract
We calculate the third coefficient of the lattice ,β-function associated with the Wilson formulation for both gauge fields and fermions. This allows us to evaluate the three-loop correction (linear in g 1 2) to the relation between the lattice Λ parameter and the bare coupling g 0, which is important in order to verify asymptotic scaling predictions. Our calculation also leads to the two-loop relation between the coupling renormalized in the MS scheme and g 0.
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