Leading-logarithmic threshold resummation of Higgs production in gluon fusion at next-to-leading power

Abstract

We sum the leading logarithms ${\alpha }_s^n{\ln }^{2n-1}(1-z)$, n=1,2,... near the kinematic threshold $z=m_H^2/\hat{s}\to 1$ at next-to-leading power in the expansion in (1-z) for Higgs production in gluon fusion. We highlight the new contributions compared to Drell-Yan production in quark-antiquark annihilation and show that the final result can be obtained to all orders by the substitution of the colour factor $C_F\to C_A$, confirming previous fixed-order results and conjectures. We also provide a numerical analysis of the next-to-leading power leading logarithms, which indicates that they are numerically relevant.

19 pages, 2 figures, and 2 tables

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