Author(s): Renaud Boussarie, Paul Caucal, Piotr Korcyl, and Yacine Mehtar-Tani High-energy QCD evolution beyond leading order suffers from instabilities driven by large collinear logarithms. We present a framework, consistent with the standard high-energy operator product expansion, that restores perturbative stability order by order. The method involves a change of basis in t… [Phys. Rev. Lett. 137, 121903] Published Tue Sep 15, 2026