Abstract
The dynamics of isolated-photon plus jet production in pp collisions at a centre-of-mass energy of 7 TeV has been studied with the ATLAS detector at the LHC using an integrated luminosity of 37 pb-1 . Measurements of isolated-photon plus jet differential cross sections are presented as functions of the photon transverse energy, the jet transverse momentum, the jet rapidity, the difference in azimuthal angle between the photon and the jet, the photon-jet invariant mass and the scattering angle in the photon-jet centre-of-mass frame. Next-to-leading-order QCD calculations are compared to the measurements and provide a good description of the data, except in the case of the azimuthal angle.
Highlights
The data were collected with the ATL√AS detector during 2010, at a centre-of-mass energy of s = 7 TeV
The measured differential cross sections refer to particle-level jets and photons which are isolated by requiring ETis,opart < 4 GeV in a cone of radius R = 0.4
The NLO QCD calculations used in the analysis presented here were computed using the program Jetphox [12]
Summary
The measured value of ETis,odet was corrected by subtracting the estimated contributions from the underlying event and additional inelastic pp interactions [6] After all these corrections, ETis,odet was required to be below 3 GeV. The measured differential cross sections refer to particle-level jets and photons which are isolated by requiring ETis,opart < 4 GeV in a cone of radius R = 0.4. For this approach to be valid, the uncorrected distributions of data must be adequately described by the MC simulations at the detector level This condition was satisfied by both the Pythia and Herwig MC samples after adjusting the relative fractions of the LO direct-photon and fragmentation components [11]
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