This letter reports a measurement of the cross section of
prompt isolated photon pair production in p anti-p collisions at a total
energy s**(1/2) ñ.96 TeV using data of 5.36 fb-1 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 (LO) parton
shower calculations and two next-to-leading order (NLO) calculations.
The NLO 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 NLO predictions.
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Updated: Tuesday, 2011 September 20 15:06:30 CDT automatically from input from "Carol Picciolo"