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Paper

Heavy quarkonium production and polarization

Abstract

We present a perturbative QCD factorization formalism for the production of heavy quarkonia of large transverse momentum at collider energies, which includes both the leading power (LP) and next-to-leading power (NLP) contributions to the cross section in the expansion for heavy quark mass . We estimate fragmentation functions in the non-relativistic QCD formalism, and reproduce the bulk of the large enhancement found in explicit NLO calculations in the color singlet model. Heavy quarkonia produced from NLP channels prefer longitudinal polarization.