Fragmentation contributions to $J/\psi$ production at the Tevatron and the LHC

We compute leading-power fragmentation corrections to J/ψ 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 αs, we obtain a good fit to high-pT cross section data from the CDF and CMS Collaborations. The fitted long-distance matrix elements lead to predictions of near-zero J/ψ polarization in the helicity frame at large pT.

Note:

5 pages, 4 figures, minor revisions, changes in notation, figures updated, version published in Physical Review Letters

12.38.Bx
12.39.St
14.40.Pq
J/psi(3100): production
J/psi(3100): polarization
perturbation theory: correction
higher-order: 1
strong interaction: coupling constant
Batavia TEVATRON Coll
CERN LHC Coll

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