Two-photon mediated resonance production in e+e− collisions: cross sections and density matrices Original Research Article

Earlier described model amplitudes are used in this paper to evaluate both cross sections and density matrices for two-photon mediated resonance production in e+e− collisions. All 25 qq̄ low-lying 1S0, 3PJ and 1D2 resonances can thus be treated. Two independent methods are described to obtain the resonance production density matrices and cross sections. These density matrices combined with a resonance decay density matrix give the detailed angular distributions of the resonance decay products. For two particular decays, χc2,χc1→γJ/ψ the details are given. Several numerical results are presented as well.