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Tests of the final-state radiation model at DAFNE near π + π - threshold

Abstract.

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 φπ + 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.

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Pancheri, G., Shekhovtsova, O. & Venanzoni, G. Tests of the final-state radiation model at DAFNE near π + π - threshold. Eur. Phys. J. A 31, 458–460 (2007). https://doi.org/10.1140/epja/i2006-10220-8

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  • DOI: https://doi.org/10.1140/epja/i2006-10220-8

PACS.

  • 13.25.Jx Decays of other mesons
  • 12.39.Fe Chiral Lagrangians
  • 13.40.Gp Electromagnetic form factors