Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-01-03
Phys.Rev.D65:112003,2002
Physics
High Energy Physics
High Energy Physics - Experiment
34 pages, submitted to Physical Review D
Scientific paper
10.1103/PhysRevD.65.112003
We have measured the cross sections $d^2\sigma/dP_T d\eta$ for production of isolated direct photons in \pbarp collisions at two different center-of-mass energies, 1.8 TeV and 0.63 TeV, using the Collider Detector at Fermilab (CDF). The normalization of both data sets agree with the predictions of Quantum Chromodynamics (QCD) for photon transverse momentum ($P_T$) of 25 GeV/c, but the shapes versus photon $P_T$ do not. These shape differences lead to a significant disagreement in the ratio of cross sections in the scaling variable $x_T (\equiv 2P_T/\sqrt{s}$). This disagreement in the $x_T$ ratio is difficult to explain with conventional theoretical uncertainties such as scale dependence and parton distribution parameterizations.
Acosta Darin
CDF Collaboration
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