Cross section and polarization observables for the reaction $e^++e^-\to a

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200318A model independent formalism for the electron positron annihilation reaction $e^++e^-\to a_1(1260)+π$ 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 $γ^*a_1π$ 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.19 pages, 6 figures Added formulas for axial meson decay in 3 pions Modified version to appear in PRCHigh Energy Physics - PhenomenologyCross section and polarization observables for the reaction $e^++e^-\to a_1(1260)+π$text