Rare Pionium Decays and Pion Polarizability

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  • 9 February 1999
Abstract
We calculate the decay of pionium atoms into two photons. The pion polarizability gives rise to a 10% correction to the corresponding decay width for pointlike pions. This opens the possibility to obtain the polarizability of the charged pion from a future measurement of this decay width if the \pi\pi-scattering lengths are known to better than 5% precision. We also comment on the contribution of the axial anomaly to the decay of pionium into \gamma\pi^0.

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