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Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

The collaboration
Phys.Rev. D85 (2012) 092014, 2012

Abstract (data abstract)
CERN-LHC. A measurement of the cross section for the production of an isolated photon in association with jets in proton-proton collisions at a center-of-mass energy sqrt(s) = 7 TeV is presented. Photons are reconstructed in the pseudorapidity range |eta(gamma)| < 1.37 and with a transverse energy E_T(gamma) > 25 GeV. Jets are reconstructed in the rapidity range |y(jet)| < 4.4 and with a transverse momentum p_T(jet) > 20 GeV. The differential cross section dsigma/dE_T(gamma) is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-p_T jet: |y(jet)| < 1.2, 1.2 <= |y(jet)| < 2.8 and 2.8 <= |y(jet)| < 4.4. For each rapidity configuration the same-sign (eta(gamma)y(jet) >= 0) and opposite-sign (eta(gamma)y(jet) < 0) cases are studied separately. The results are based on an integrated luminosity of 37 pb-1, collected with the ATLAS detector at the LHC. Next-to-leading order perturbative QCD calculations are found to be in fair agreement with the data, except for E_T(gamma) <~ 45 GeV, where the theoretical predictions overestimate the measured cross sections. Note added (27 JUN 2014): The cross section values reported in Tables 1-6 below should be multiplied by a factor of 1.0187 to take into account the updated value of the integrated luminosity for the ATLAS 2010 data taking period. The uncertainty on the global normalisation ("Lumi") increases slightly from 3.4% to 3.5%. See Eur.Phys.J. C73 (2013) 2518 for more details. Note that the Lumi uncertainty is added in the total systematic uncertainties, which are given in absolute value.

• #### Table 1

Data from T 17,F 1,3

10.17182/hepdata.58652.v1/t1

The measured cross section as a function of the photon transverse energy, ET, for pT(jet)>20 GeV, |eta(gamma)|<1.37, |y(jet)|<1.2, eta(gamma)*y(jet)>=0.

• #### Table 2

Data from T 19,F 1,3

10.17182/hepdata.58652.v1/t2

The measured cross section as a function of the photon transverse energy, ET, for pT(jet)>20 GeV, |eta(gamma)|<1.37, 1.2<=|y(jet)|<2.8, eta(gamma)*y(jet)>=0.

• #### Table 3

Data from T 21,F 1,3

10.17182/hepdata.58652.v1/t3

The measured cross section as a function of the photon transverse energy, ET, for pT(jet)>20 GeV, |eta(gamma)|<1.37, 2.8<=|y(jet)|<4.4, eta(gamma)*y(jet)>=0.

• #### Table 4

Data from T 18,F 1,3

10.17182/hepdata.58652.v1/t4

The measured cross section as a function of the photon transverse energy, ET, for pT(jet)>20 GeV, |eta(gamma)|<1.37, |y(jet)|<1.2, eta(gamma)*y(jet)<0.

• #### Table 5

Data from T 20,F 1,3

10.17182/hepdata.58652.v1/t5

The measured cross section as a function of the photon transverse energy, ET, for pT(jet)>20 GeV, |eta(gamma)|<1.37, 1.2<=|y(jet)|<2.8, eta(gamma)*y(jet)<0.

• #### Table 6

Data from T 22,F 1,3

10.17182/hepdata.58652.v1/t6

The measured cross section as a function of the photon transverse energy, ET, for pT(jet)>20 GeV, |eta(gamma)|<1.37, 2.8<=|y(jet)|<4.4, eta(gamma)*y(jet)<0.