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This Letter reports a measurement of the cross section for producing pairs ofcentral prompt isolated photons in proton-antiproton collisions at a totalenergy of 1.96 TeV using data corresponding to 9.5/fb integrated luminositycollected with the CDF II detector at the Fermilab Tevatron. The measureddifferential cross section is compared to three calculations derived from thetheory of strong interactions. These include a prediction based on a leadingorder matrix element calculation merged with parton shower, a next-to-leadingorder, and a next-to-next-to-leading order calculation. The first and lastcalculations reproduce most aspects of the data, thus showing the importance ofhigher-order contributions for understanding the theory of strong interactionand improving measurements of the Higgs boson and searches for new phenomena indiphoton final states.

Measurement of the cross section for prompt isolated diphoton production using the full CDF Run II data sample