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Review finds pion polarizability experiments need replication, suggesting significant expected rate increases at DAFNE.
We review the γγ->ππ data and conclude that the experiments should be redone and that an increase of 10^2 in the rates is expected at DAPHNE. The status of the data on the pion polarizability ?_? is also considered briefly. We compare the data with the prediction of chiral perturbation theory. In the case of neutral pions, by including the exchange of vector resonances in the t-channel, we prove that the O(p^6) contribution cannot be neglected and gives (20 -30)% of the cross-section at (460 - 490)meV.
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D et al. (1991) studied this question.
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