$\chi_{c1}$ and $\chi_{c2}$ production at $e^+e^-$ colliders
  Direct, resonant production of the charmonium states $\chi_{c1}$ and $\chi_{c2}$ in electron-positron annihilation is investigated. Depending on details of the model, a sizeable variation of the prediction for the production cross section is anticipated. It is demonstrated that resonant production could be observed under favorable circumstances. 
Henryk Czyz, Johann H. K\"uhn, Szymon Tracz
hep-ph