Absorptive contents of pionic-atom optical potentials and the anomaly problem

We show that the imaginary parts of a pionic-atom optical potential cannot be a candidate, by themselves, for the explanation of the anomaly problem, when two-nucleon absorption is assumed to be described effectively by quadratic forms of nuclear densities. By examining multinucleon absorption processes, we find a criterion that will help to determine whether a potential fit to pionic-atom data (especially to anomalous data), is acceptable.