This article reports a measurement of the production cross
section of prompt isolated photon pairs in proton-antiproton collisions
at s**(1/2) ñ.96 TeV using the CDF II detector at the Fermilab Tevatron
collider. The data correspond to an integrated luminosity of 5.36 fb-1.
The cross section is presented as a function of kinematic variables
sensitive to the reaction mechanisms. The results are compared with
three perturbative QCD calculations: (1) a leading order parton
shower Monte Carlo, (2) a fixed next-to-leading order calculation
and (3) a next-to-leading order/next-to-next-to-leading-log resummed
calculation. The comparisons show that, within their known limitations,
all calculations predict the main features of the data, but no calculation
adequately describes all aspects of the data.
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Updated: Wednesday, 2011 September 21 09:50:44 CDT automatically from input from "Carol Picciolo"