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We consider the renormalization of the matrix elements of the bilinear quarkoperators $\bar{\psi}\psi$, $\bar{\psi}\gamma_\mu\psi$, and$\bar{\psi}\sigma_{\mu\nu}\psi$ at next-to-next-to-next-to-leading order in QCDperturbation theory at the symmetric subtraction point. This allows us toobtain conversion factors between the $\overline{\rm MS}$ scheme and theregularization invariant symmetric momentum subtraction (RI/SMOM) scheme. Theobtained results can be used to reduce the errors in determinations of quarkmasses from lattice QCD simulations. The results are given in Landau gauge.

Bilinear quark operators in the RI/SMOM scheme at three loops