Test of FSR in the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma$ at DA$\Phi$NE and extraction of the pion form factor at threshold

Abstract

Effects due to non-pointlike behaviour of pions in the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma$ 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 $\varphi \to {\pi }^{+}{\pi }^{-}\gamma$, we estimate these effects in the framework of 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 non-pointlike behaviour of pions in a model-independent way is proposed.

13 pages, 6 figures

References in corpus (1)

• The e+ e- -> P1 P2 gamma processes close to the Phi peak: toward a model-independent analysis

Cited by in corpus (4)

• Hadronic decays of the tau lepton: Theoretical outlook
• Final state radiation and a possibility to test a pion-photon interaction model near two-pion threshold
• FASTERD: a Monte Carlo event generator for the study of final state radiation in the process $e^{+}{e}^{-}\to \pi \pi \gamma$ at DA$\Phi$NE
• PHOKHARA, the radiative return and the $(g-2{)}_{\mu }$ puzzle