Abstract
The absence of strong interaction corrections to the axial anomaly in the σ model is proved in a cut-off independent way using Zimmermann's normal product algorithm.
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Becchi, C. Absence of strong interaction corrections to the axial anomaly in the σ model. Commun.Math. Phys. 33, 97–117 (1973). https://doi.org/10.1007/BF01645622
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DOI: https://doi.org/10.1007/BF01645622