NNLO QCD [132, 157]: Bouzid Boussaha, Farida Iddir, Lahouari Semlala; 2gamma from Catani, Cieri, de Florian, Ferrera and Grazzini, Diphoton production at hadron colliders: a fully-differential QCD calculation at NNLO.
Combined p-value for this prediction is 4.05E-19.