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A model independent formalism for the electron positron annihilation reaction$e^++e^-\to a_1(1260)+\pi $ has been derived. The differential and total crosssections and the elements of the spin--density matrix of the $a_1$-meson werecalculated in terms of the electromagnetic form factors of the corresponding$\gamma^*a_1\pi $ current. Simple models of $a_1$ form factors have been fittedto the available cross section data and they allow to give numericalpredictions for the different observables.

Cross section and polarization observables for the reaction $e^++e^-\to a_1(1260)+\pi $