A remark on the vanishing of evanescent operators

Summary

The calculation of QCD corrections to local operators involving quark and gluon fields generates evanescent operators which vanish whenn the dimension of the Feynman integrals equals 4. These operators when renormalized with minimal subtraction do not vanish forn=4, and we show that there is a non-minimal subtraction scheme, in which these operations remain vanishing forn=4, and the physical operators are left unchanged to all orders ing, the QCD coupling constant.