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arXiv · 2609.39029

Resummation of threshold double logarithms in gluon fragmentation into $^1S_0^{[1,8]}$ quarkonia

Hee Sok Chung
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Abstract

I investigate the threshold double logarithmic behavior of the fragmentation function of a gluon into $^1S_0^{[1,8]}$ quarkonia, which is suppressed by $1/N$ in Mellin space. While threshold double logarithms have been resummed to all orders in the strong coupling for gluon fragmentation functions for quarkonia at leading power in $1/N$, it has not been known how to resum them for channels suppressed by powers of $1/N$. Threshold resummation can be important for the $^1S_0^{[1,8]}$ channels, as the tree-level gluon fragmentation functions have finite yet nonzero values at the kinematical threshold. I derive a formalism for resumming the threshold double logarithms for these channels at the leading double logarithmic level and discuss the phenomenological impact.

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Hee Sok Chung. 2026-09-30. Resummation of threshold double logarithms in gluon fragmentation into $^1S_0^{[1,8]}$ quarkonia. https://arxiv.org/abs/2609.39029

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