This letter reports a measurement of the cross section of prompt isolated photon pair production in p-pbar collisions at a total energy √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 (LO) parton shower calculation 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.
Measurement of the cross section for prompt isolated diphoton production in pp̄ collisions at √s=1.96TeV
CAUZ, Diego;PAULETTA, Giovanni;SANTI, Lorenzo Gianni;
2011-01-01
Abstract
This letter reports a measurement of the cross section of prompt isolated photon pair production in p-pbar collisions at a total energy √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 (LO) parton shower calculation 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.