Abstract
We estimate the lattice artifacts in loop corrections perturbatively for domain-wall QCD with an infinite number of extra flavors. We find that there appear no $\mathcal{O}(a)$ errors in renormalization factors of the quark wave function, mass, and quark bilinear operators at the one- and two-loop levels with off-shell quark momentum. Our proof is based on the even- or oddness of the quantum correction in terms of the quark external momentum and mass, and it can be extended to any loop level.
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