Article,

Path Integral Measure for Gauge Invariant Fermion Theories

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Phys. Rev. Lett., (1979)
DOI: 10.1103/PhysRevLett.42.1195

Abstract

It is shown that the path-integral measure for gauge-invariant fermion theories is not invariant under the γ5 transformation and the Jacobian gives rise to an extra phase factor corresponding to the Adler-Bell-Jackiw anomaly. The derivation of änomalous" Ward-Takahashi identities by means of the variational derivative can thus be made consistent in the path-integral formalism.

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