Author(s): Michał Czakon, Felix Eschment, Terry Generet, and Rene Poncelet The production of two isolated photons at the Large Hadron Collider has applications in Higgs-boson phenomenology and in new-physics searches. In fact, measurements would provide more insight if a percent-level theoretical prediction were available. We account for next-to-next-to-next-to-leading-ord… [Phys. Rev. Lett. 137, 171901] Published Wed Oct 21, 2026