Inclusive charmonium production via double c(c)over-bar in e+e- annihilation -: art. no. 094027

Motivated by the recent observation of double-charm quark pair production by the Belle Collaboration, we calculate the complete O(alpha(s)(2)) inclusive production cross sections for eta(c), J/psi, and chi(cJ) (J=0,1,2) plus c (c) over bar in e(+)e(-) annihilation through a virtual photon. We consider both color-singlet and color-octet contributions, and give the analytical expressions for these cross sections. The complete color-singlet calculations are compared with the approximate fragmentation calculations as functions of the center-of-mass energy roots We find that most of the fragmentation results substantially overestimate the cross sections (e.g., by a factor of similar to4 for chi(c1) and chi(c2)) at the Belle and BaBar energy roots=10.6 GeV. The fragmentation results become a good approximation only when roots is higher than about 100 GeV. We further calculate the color-octet contributions to these cross sections with analytical expressions. We find that while the color-octet contribution to J/psi inclusive production via double charm is negligible (only about 7%), the color-octet contributions to chi(c1) and chi(c2) can be very significant.