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2014

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

Ma, Yan-Qing, Qiu, Jian-Wei, Sterman, George et al.

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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.

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

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