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Factorized power expansion for high-$p_T$ heavy quarkonium production

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arxiv 1407.0383 v2 pith:MKHU4OE4 submitted 2014-07-01 hep-ph hep-ex

Yan-Qing Ma , Jian-Wei Qiu , George Sterman , Hong Zhang This is my paper · ORCID
classification hep-phhep-ex
keywords heavyproductionnrqcdpowerquarkoniumcalculatedcontributionsfactorized
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We show that when the factorized cross section for heavy quarkonium production includes next-to-leading power (NLP) contributions associated with the production of the heavy quark pair at short distances, it naturally reproduces all high $p_T$ results calculated in non-relativistic QCD (NRQCD) factorization. This extended formalism requires fragmentation functions for heavy quark pairs, as well as for light partons. When these fragmentation functions are themselves calculated using NRQCD, we find that two of the four leading NRQCD production channels, ${^3\hspace{-0.6mm}S_{1}^{[1]}}$ and ${^1\hspace{-0.6mm}S_{0}^{[8]}}$, are dominated by the NLP contributions for a very wide $p_T$ range. The large next-to-leading order corrections of NRQCD are absorbed into the leading order of the first power correction. The impact of this finding on the heavy quarkonium production and its polarization is discussed.

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Cited by 4 Pith papers

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