Measurement of the Cross Section for Prompt Diphoton Production inpp¯Collisions ats=1.96TeV

We report a measurement of the rate of prompt diphoton production in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ using a data sample of $207{\mathrm{pb}}^{-1}$ collected with the upgraded Collider Detector at Fermilab. The background from nonprompt sources is determined using a statistical method based on differences in the electromagnetic showers. The cross section is measured as a function of the diphoton mass, the transverse momentum of the diphoton system, and the azimuthal angle between the two photons and is found to be consistent with perturbative QCD predictions.