This thesis reports on the first studies of Standard Model photon production at the Large Hadron Collider (LHC) using <br>the ATLAS detector.  Standard Model photon production is a large background in the search for Higgs bosons decaying into <br>photon pairs, and is thus critical to understand.  The thesis explains the techniques used to reconstruct and identify <br>photon candidates using the ATLAS detector, and describes a measurement of the production cross section for isolated <br>prompt photons.  The thesis also describes a search for the Higgs boson in which the analysis techniques used in the <br>measurement are exploited to reduce and estimate non-prompt backgrounds in diphoton events.

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