Abstract
Combining the real and imaginary parts of the pion form factor from the resonant region, given by a simple formula obtained by means of the dispersion relation method, with some special assumptions in the asymptotic region and sum rules, the time-like region form factor tail is predicted. Further, the existence of form factor zeros is investigated and on the basis of numerical results one can conclude that zeros of the pion form factor exist. By means of the unsubtracted dispersion relation, the predicted space-like region behaviour of the form factor is found to be in excellent agreement with the existing experimental data.
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