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Yeh, GP; Yi, K; Yoh, J; Yorita, K; Yoshida, T; Yu, GB; Yu, I; Yu, SS; Yun, JC; Zanetti, A; Zeng, Y; Zucchelli, S; - view fewer (2011) Measurement of the Cross Section for Prompt Isolated Diphoton Production in p (p)over-bar Collisions at root s=1.96 TeV. PHYS REV LETT , 107 (10) , Article 102003. 10.1103/PhysRevLett.107.102003.

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Abstract

This Letter reports a measurement of the cross section of prompt isolated photon pair production in p (p) over bar collisions at a total energy root s = 1.96 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 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.

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