Measurement of the cross section for prompt diphoton production in pp collisions at square root of s=1.96 TeV

Phys Rev Lett. 2005 Jul 8;95(2):022003. doi: 10.1103/PhysRevLett.95.022003. Epub 2005 Jul 8.

Abstract

We report a measurement of the rate of prompt diphoton production in pp collisions at square root of s=1.96 TeV using a data sample of 207 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.