Resummation of threshold double logarithms in gluon fragmentation into ${}^1{S}_0^{[1,8]}$ quarkonia

I investigate the threshold double logarithmic behavior of the fragmentation function of a gluon into ${}^1{S}_0^{[1,8]}$ quarkonia, which is suppressed by $1\mathrm{/}N$ 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 $1\mathrm{/}N$, it has not been known how to resum them for channels suppressed by powers of $1\mathrm{/}N$. Threshold resummation can be important for the ${}^1{S}_0^{[1,8]}$ 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.