Measurement of the cross section for production of two isolated prompt photons inpp¯collisions at √s=1.8 TeV

We present measurements from events with two isolated prompt photons in p{}p collisions at {}s =1.8 TeV. The differential cross section, measured as a function of transverse momentum (PT) of each photon, is about 3 times what next-to-leading-order QCD calculations predict. The cross section for photons with PT in the range 10--19 GeV is 86±{}27(stat)_-23⁺³²(syst) pb. We also study the correlation between the two photons in both azimuthal angle and PT. The magnitude of the vector sum of the transverse momenta of both photons, KT={}PT1+PT2{}, has a mean value of 〈KT〉=5.1±{}1.1 GeV.