Test of FSR in the process $e^+e^-\toπ^+π^-γ$ at DA$Φ$NE and extraction of the pion form factor at threshold

Details Test of FSR in the process $e^+e^-\toπ^+π^-γ$ at DA$Φ$NE and extraction of the pion form factor at threshold Test of FSR in the process $e^+e^-\toπ^+π^-γ$ at DA$Φ$NE and extraction of the pion form factor at threshold

2006-05-23

arxiv.org/abs/hep-ph/0605244v1

Phys.Lett.B642:342-349,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 6 figures

Scientific paper

10.1016/j.physletb.2006.09.053

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 $\phi\to\pi^+\pi^-\gamma$, 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.

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