Double gluon fragmentation to $J/\psi$ pairs at the Tevatron

V. Barger, S. Fleming, R. J. N. Phillips

It has been proposed that the large cross sections for prompt $\psi$, ${\psi }^{\prime }$, and ${\chi }_c$ production at the Fermilab Tevatron $p\bar{p}$ collider can be explained by a dominant color-octet…