Tests of the final-state radiation model at DAFNE near π + π - threshold
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Effects due to the non-pointlike behaviour of pions in the process e + e -→π + π - γ can arise for hard photons in the final state. By means of a Monte Carlo event generator, which also includes the contribution of the direct decay φ→π + π - γ, we estimate these effects in the framework of the resonance perturbation theory. We consider angular cuts used in the KLOE analysis of the pion form factor at threshold. A method to reveal the effects of the non-pointlike behaviour of pions in a model-independent way is proposed.
PACS.13.25.Jx Decays of other mesons 12.39.Fe Chiral Lagrangians 13.40.Gp Electromagnetic form factors
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