Theoretical Predictions for Pionium Searches

M. Sander, C. Kuhrts, H. V. von Geramb

Characteristic properties of pionium $A_{2\pi }$ and associated low energy s--wave cross sections $\sigma ({\pi }^0{\pi }^0\to {\pi }^0{\pi }^0)$, $\sigma ({\pi }^{+}{\pi }^{-}\to {\pi }^0{\pi }^0)$ and $\sigma ({\pi }^0{\pi }^0\to {\pi }^{+}{\pi }^{-})$ are investigate…