### Prompt photon measurements with the ATLAS detector.

Leonardo Carminati
An overview of the main prompt photon measurements with the ATLAS detector is presented. The production cross sections for inclusive photons, photon plus jets and diphotons have been measured with 37 pb$^{-1}$ of $pp$ collisions at $\sqrt{s}$=7 TeV collected at the LHC in 2010. Data have been found to be in fair agreement with next-to-leading order perturbative QCD calculations. The overall picture confirms that QCD photons are well understood in ATLAS laying solid foundations for...