Measurement of the inclusive isolated prompt photon cross section in pp̄ collisions at s=1.96TeV 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 pseudorapidity region $|{\ensuremath{\eta}}^{\ensuremath{\gamma}}|l1.0$ and the transverse energy range ${E}_{T}^{\ensuremath{\gamma}}g30\text{ }\text{ }\mathrm{GeV}$ and is based on $2.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity. The sample is almost a factor of 7 larger than those used for recent published results and extends the ${E}_{T}^{\ensuremath{\gamma}}$ coverage by 100 GeV. The result agrees with next-to-leading order perturbative QCD calculations within uncertainties over the range $50l{E}_{T}^{\ensuremath{\gamma}}l400\text{ }\text{ }\mathrm{GeV}$, though the energy spectrum in the data shows a steeper slope at lower ${E}_{T}^{\ensuremath{\gamma}}$.