Leading logarithms in the anomalous sector of two-flavour QCD Original Research Article

We add the Wess–Zumino–Witten term to the image massive nonlinear sigma model and study the leading logarithms in the anomalous sector. We obtain the leading logarithms to six loops for image and to five loops for image. In addition we extend the earlier work on the mass and decay constant to six loops and the vector form factor to five loops. We present numerical results for the anomalous processes and the vector form factor. In all cases the series are found to converge rapidly.