Fragmentation Contributions to J/psi Production at the Tevatron and the LHC

Abstract

We compute leading-power fragmentation corrections to J/psi production at the Tevatron and the LHC. We find that, when these corrections are combined with perturbative corrections through next-to-leading order in the strong coupling constant alpha(s), we obtain a good fit to high-p(T) cross section data from the CDF and CMS Collaborations. The fitted long-distance matrix elements lead to predictions of near-zero J/psi polarization in the helicity frame at large p(T).