Abstract
A new expression for the pion form factor F π is proposed. It takes into account the pseudoscalarmeson loops and the mixing of ρ ( 770 ) with heavier ρ ( 1450 ) and ρ ( 1700 ) resonances. The expression has correct analytical properties and can be used in both timelike and spacelike kinematical regions. The comparison is made with the existing experimental data on F π collected with the detectors SND, CMD-2, KLOE, and the BaBaR restricted to energies below 1 GeV. A good description of all four data sets is obtained. In the spacelike region, upon substituting the resonance parameters found in the timelike one, one obtains F π in agreement with the measurements of NA7 Collaboration.
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