Prove that higher order corrections do not change the chiral

Prove that higher order corrections do not change the chiral anomaly ∂μJ μ

5 = [1/(4π)2]εμνλσ tr FμνFλσ

(I have rescaled A → (1/g)A). [Hint: Integrate over spacetime and show that the left hand side is given

by the number of right-handed fermion quanta minus the number of left-handed fermion quanta, so

that both sides are given by integers.]


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