Relativistic corrections and high-energy resummation for exclusive heavy quarkonium photoproduction

Abstract

The $O(v^2)$ correction to the high-energy resummed coefficient function for the exclusive photoproduction of vector ($1^{--}$) heavy quarkonia off hadrons is computed, thereby taking into account corrections of $O(v^2 α_s^n \ln^{n-1}(x/ξ))$. When expressed in terms of the physical vector-meson mass ($M_V$) and the relative heavy-quark velocity ($\langle v^2 \rangle$) using the Gremm-Kapustin relation, the computed correction turns out to be negligible at the scale $μ_F=M_V$. However, it partially cancels the $μ_F$ dependence of the $O(v^2)$ correction to the LO coefficient function in $α_s$, thereby improving the robustness of the predictions.