Measurement of the Inclusive Isolated Prompt Photon Cross Section in p anti-p Collisions at s**(1/2) =1.96 TeV using the CDF Detector

A measurement of the cross section for the inclusive production of isolated photons by the CDF experiment at the Fermilab Tevatron collider is presented. The measurement covers the pseudorapi+dity region |etagamma| &lt; 1.0 and the transverse energy range Egamma_T > 30 GeV and is based on 2.5 fb-1 of integrated luminosity. The sample is almost a factor of seven larger than those used for recent published results and extends the Egamma_T coverage by 100 GeV. The result agrees with next-to-leading order perturbative QCD calculations within uncertainties over the range 50 < Egamma_T &lt; 400 GeV, though the energy spectrum in the data shows a steeper slope at lower Egamma_T.