Summary
We show that in the weak-coupling regime BRST symmetry of the Faddeev-Popov Lagrangian is exact. The use of the resultant Slavnov-Taylor identities is then justifiable within naive perturbations.
References
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Shintani, M. Dynamical stability of BRST symmetry in Yang-Mills theories. Nuov Cim A 104, 131–134 (1991). https://doi.org/10.1007/BF02822273
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DOI: https://doi.org/10.1007/BF02822273