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Title

Comparison of the isolated direct photon cross sections in pp collisions at s√=1.8 TeV and s√=0.63 TeV

CollaborationWith : Clark, Allan Geoffrey / Kambara, Hisanori / Speer, Thomas / Strumia Michelini, Federica / Wu, Xin
Published in . 2002, vol. 65, no. 11
Abstract We have measured the cross sections d2σ/dPTdη for production of isolated direct photons in pp¯ collisions at two different center-of-mass energies, 1.8 TeV and 0.63 TeV, using the Collider Detector at Fermilab. The normalization of both data sets agrees with the predictions of quantum chromodynamics for a photon transverse momentum (PT) of 25 GeV/c, but the shapes versus photon PT do not. These shape differences lead to a significant disagreement in the ratio of cross sections in the scaling variable xT(≡2PT/s√). This disagreement in the xT ratio is difficult to explain with conventional theoretical uncertainties such as scale dependence and parton distribution parametrizations.
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CDF COLLABORATION. Comparison of the isolated direct photon cross sections in pp collisions at s√=1.8 TeV and s√=0.63 TeV. In: Physical Review. D, 2002, vol. 65, n° 11. doi: 10.1103/PhysRevD.65.112003 https://archive-ouverte.unige.ch/unige:38029

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Deposited on : 2014-06-23

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