Abstract
This Letter reports a measurement of the cross section of prompt isolated photon pair production in collisions at a total energy using data of integrated luminosity collected with the CDF II detector at the Fermilab Tevatron. The measured cross section, differential in basic kinematic variables, is compared with three perturbative QCD predictions, a leading order parton shower calculation and two next-to-leading order calculations. The next-to-leading order calculations reproduce most aspects of the data. By including photon radiation from quarks before and after hard scattering, the parton shower prediction becomes competitive with the next-to-leading order predictions.
- Received 29 June 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.102003
© 2011 American Physical Society