Theoretical Predictions for Pionium Searches

Abstract

Characteristic properties of pionium $A_{2π}$ and associated low energy s--wave cross sections $σ(π^0π^0\to π^0π^0)$, $σ(π^+π^-\toπ^0π^0)$ and $σ(π^0π^0\to π^+π^-)$ are investigated with a coupled channels potential model. Some experimental results and conclusions are to be reconsidered.