Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. D 70, 074008 (2004). Copyright © 2004 American Physical Society. Permission to use.


We present a measurement of the isolated direct photon cross section in pp̅ collisions at √s =1.8 TeV and |η|0→γγ and η→γγ events from the data we use a new background subtraction technique which takes advantage of the tracking information available in a photon conversion event. We find that the shape of the cross section as a function of photon pT is poorly described by next-to-leading-order QCD predictions, but agrees with previous CDF measurements.

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