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Measurement of the isolated diphoton cross-section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

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Measurement of the isolated diphoton cross-section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

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ATLAS Collaboration; Mitsou, Vasiliki; Fiorini, Luca; Ros Martínez, Eduardo; Fuster Verdú, Juan A.; García García, Carmen; Cabrera Urbán, Susana; Martí García, Salvador; Salt Cairols, José; Lacasta Llácer, Carlos; Valls Ferrer, Juan Antonio; Villaplana Pérez, Miguel; Castillo Giménez, María Victoria; Higón Rodríguez, Emilio; Ferrer Soria, Antonio; González de la Hoz, Santiago; Kaci, Mohammed; Hernández Jiménez, Yesenia

Aquest document és un/a article, creat/da en: 2012

Este documento está disponible también en : 10.1103/PhysRevD.85.012003

The ATLAS experiment has measured the production cross section of events with two isolated photons in the final state, in proton-proton collisions at root s = 7 TeV. The full data set acquired in 2010 is used, corresponding to an integrated luminosity of 37 pb(-1). The background, consisting of hadronic jets and isolated electrons, is estimated with fully data-driven techniques and subtracted. The differential cross sections, as functions of the di-photon mass (m(gamma gamma)), total transverse momentum (p(T),(gamma gamma)), and azimuthal separation (Delta phi(gamma gamma)), are presented and compared to the predictions of next-to-leading-order QCD.

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