Second-Order Radiative Corrections to the Triangle Anomaly. II

Abstract

In a preceding paper, we have calculated the radiative correction to the "triangle anomaly," using source-theoretical techniques. Here we apply the same methods to a different causal arrangement, and obtain the same result, giving a total anomaly through order $\ensuremath{\alpha}$ proportional to $1+\frac{\ensuremath{\alpha}}{2\ensuremath{\pi}}$. In order to obtain this result, we found it necessary to compute (for ${m}_{\ensuremath{\pi}}=0$) the first radiative corrections to the ${\ensuremath{\pi}}^{0}$ photoproduction amplitudes, which are presented here for the first time.