Measurement of the cross section for prompt isolated diphoton production in pp collisions at square root(s) = 1.96 TeV.
Aaltonen T, Álvarez González B, Amerio S, Amidei D, Anastassov A, Annovi A, Antos J, Apollinari G, Appel JA, Apresyan A, et al. Phys Rev Lett. 2011 Sep 2; 107(10):102003. Epub 2011 Sep 2.