Measurement of differential cross section for inclusive production of isolated photons in p pbar collisions at √s=1.96 TeV with the D\O detector at the Fermilab Tevatron collider. The photons span transverse momenta 23--300 GeV and have pseudorapidity |η|<0.9. Isolated direct photons are probes of pQCD via the annihilation (qˉq−>γg) and quark-gluon Compton scattering (qg−>γq) processes, the latter of which is also sensitive to the gluon PDF. The initial state radiation / resummation formalisms are sensitive to the resulting photon pT spectrum
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