The three-loop ghost-loop contribution to the beta function of N=1 SYM is shown to match the NSVZ equation via the two-loop ghost anomalous dimension, verifying the gamma_c term in the NSVZ relation.
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Three-loop contribution of the Faddeev-Popov ghosts to the $\beta$-function of ${\cal N}=1$ supersymmetric gauge theories and the NSVZ relation
The three-loop ghost-loop contribution to the beta function of N=1 SYM is shown to match the NSVZ equation via the two-loop ghost anomalous dimension, verifying the gamma_c term in the NSVZ relation.