Heavy quarkonium production and polarization

Details Heavy quarkonium production and polarization Heavy quarkonium production and polarization

2011-09-07

arxiv.org/abs/1109.1520v1

Phys. Rev. Lett. 108, 102002 (2012)

Physics

High Energy Physics

High Energy Physics - Phenomenology

latex, 11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.108.102002

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 $m_Q^2/p_T^2$ 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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