Z_V for HISQ vector currents is exact and condensate-free in RI-SMOM and in a modified ratio scheme, but the standard RI'-MOM scheme has O(1%) condensate contamination.
Wilson Expansion of QCD Propagators at Three Loops: Operators of Dimension Two and Three
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In this paper we construct the Wilson short distance operator product expansion for the gluon, quark and ghost propagators in QCD, including operators of dimension two and three, namely, A^2, m^2, m A^2, \ovl{\psi} \psi and m^3. We compute analytically the coefficient functions of these operators at three loops for all three propagators in the general covariant gauge. Our results, taken in the Landau gauge, should help to improve the accuracy of extracting the vacuum expectation values of these operators from lattice simulation of the QCD propagators.
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Renormalising vector currents in lattice QCD using momentum-subtraction schemes
Z_V for HISQ vector currents is exact and condensate-free in RI-SMOM and in a modified ratio scheme, but the standard RI'-MOM scheme has O(1%) condensate contamination.