Conclusion

Abstract

This thesis has presented two measurements of the inclusive isolated prompt photon cross section at $\sqrt{s}=7$ TeV with the ATLAS detector. The first measurement is based on 880 nb$^{-1}$ of data, and evaluated $d\sigma /dE_{\text{T}}^{\gamma }$ in three pseudorapidity regions, over the range $15\,\text{GeV} \le E_{\text{T}}^{\gamma }< 100\,\text{GeV}$. The second is based on 35 pb$^{-1}$ of data and was made in four pseudorapidity regions over the range $45\,\text{GeV} \le E_{\text{T}}^{\gamma }< 400\,\text{GeV}$. The measurements are generally consistent with theoretical predictions made by the JETPHOX program, though the data at low values of $E_{\text{T}}^{\gamma }$ and $\eta ^{\gamma }$ seem to favor smaller cross sections than predicted by theory.