A measurement of the cross section for the production of isolated prompt photons in $pp$ collisions at a center-of-mass energy $\sqrt{s}=7\mathrm{TeV}$ is presented. The results are based on an integrated luminosity of $4.6{\mathrm{fb}}^{-1}$ collected with the ATLAS detector at the LHC. The cross section is measured as a function of photon pseudorapidity ${\eta }^{\gamma }$ and transverse energy $E_{\mathrm{T}}^{\gamma }$ in the kinematic range $100\le E_{\mathrm{T}}^{\gamma }<1000\mathrm{GeV}$ and in the regions $|{\eta }^{\gamma }|<1.37$ and $1.52\le |{\eta }^{\gamma }|<2.37$. The results are compared to leading-order parton-shower Monte Carlo models and next-to-leading-order perturbative QCD calculations. Next-to-leading-order perturbative QCD calculations agree well with the measured cross sections as a function of $E_{\mathrm{T}}^{\gamma }$ and ${\eta }^{\gamma }$.

• Received 7 November 2013

DOI:https://doi.org/10.1103/PhysRevD.89.052004

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© 2014 CERN, for the ATLAS Collaboration