[en] The formation of the states with positive charge conjugation through the neutral current is discussed. It can be evaluated in a simple and straightforward manner in the nonrelativistic quarkonium model, identifying the resonances as ³P₁ bound state. The observation of this reaction would test the coupling of quarks to the axial part and of electrons to the vector and axial vector part of the neutral current. Although this process is neglegibly small for the Psub(c)/chi (3500), it may contribute a measurable amount, if a toponium system were found around 35 GeV. The competing mechanism of the formation - the electromagnetic annihilation of e⁺e^- through two virtual photons into 1⁺⁺ and 2⁺⁺ states is also investigated. The various models (quarkonium model, vector dominance model, generalized vector dominance model) all consistently give values between 0.1 eV and 0.4 eV for Gamma(³P₁ → e⁺e^-). In this case the electromagnetic production dominates the weak production whereas for heavier quarkonium systems the situation is reversed. Finally, it is quite straightforward to translate our results from QED to QCD. We then calculate chi production in hadronic collisions, in particular the contribution which comes from quark-antiquark annihilation. This can be compared to estimates for charmonium production by ''color evaporation'' which gives quite different results for the relative weight of chi₀, chi₁ and chi₂ (author)