Prompt J/psi production from Tevatron to LHC
  Models with essential non-perturbative QCD dynamics and describing Tevatron data on high-$p_\perp$ charmonium are extrapolated to give predictions of prompt J/psi production at the LHC. Differences of up to an order of magnitude occurs. An important point is here the treatment of higher order perturbative QCD effects. 
C. Brenner Mariotto (Rio Grande do Sul U.), J. Damet (Bern U.), G.   Ingelman (Uppsala U.)