A prompt photon cross section measurement from the Collider Detector at Fermilab experiment is presented. Detector and trigger upgrades, as well as 6 times the integrated luminosity compared with our previous publication, have contributed to a much more precise measurement and extended $P_T$ range. As before, QCD calculations agree qualitatively with the measured cross section, but the data has a steeper slope than the calculations.

• Received 26 July 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.2662