Heavy quarkonium production and polarization

2011/09/07 by Zhong-Bo Kang, Jian-Wei Qiu, George Sterman · 1 citation
Physics and Astronomy · #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevlett.108.102002

published as Phys. Rev. Lett. 108, 102002 (2012) · latex, 11 pages, 4 figures

arxiv created 2011/09/07 · arxiv updated 2012/03/12

Abstract

We present a perturbative QCD factorization formalism for the production of heavy quarkonia of large transverse momentum p_T at collider energies, which includes both the leading power (LP) and next-to-leading power (NLP) contributions to the cross section in the m_Q²/p_T² expansion for heavy quark mass m_Q. 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.

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