| Irfu-08-16
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| Cross section and polarization observables for the reaction
$e^++e^-\to a_1(1260)+\pi $ |
| E. Tomasi--Gustafsson, G. I. Gakh, C. Adamuscin |
| A model independent formalism for the electron positron annihilation reaction $e^++e^-\\to a_1(1260)+\\pi $ has been derived. The differential and total cross sections and the elements of the spin--density matrix of the $a_1$-meson were calculated in terms of the electromagnetic form factors of the corresponding $\\gamma^*a_1\\pi $ current. Simple models of $a_1$ form factors have been fitted to the available cross section data and they allow to give numerical predictions for the different observables.
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