Measurement of the Differential Cross-Section for the Production of an Isolated Photon with Associated Jet in $p \bar{p}$ Collisions at $\sqrt{s}$ = 1.96-TeV

Tanasijczuk, Andres Jorge;D0;et.al.
(2008) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 666, p. 435 (2008)

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Abstract
The process pp¯→γ+jet+X is studied using 1.0 fb −1 of data collected by the D0 detector at the Fermilab Tevatron pp¯ collider at a center-of-mass energy s=1.96 TeV . Photons are reconstructed in the central rapidity region |yγ|<1.0 with transverse momenta in the range 30<pTγ<400 GeV while jets are reconstructed in either the central |yjet|<0.8 or forward 1.5<|yjet|<2.5 rapidity intervals with pTjet>15 GeV . The differential cross section d3σ/dpTγdyγdyjet is measured as a function of pTγ in four regions, differing by the relative orientations of the photon and the jet in rapidity. Ratios between the differential cross sections in each region are also presented. Next-to-leading order QCD predictions using different parameterizations of parton distribution functions and theoretical scale choices are compared to the data. The predictions do not simultaneously describe the measured normalization and pTγ dependence of the cross section in the four measured regions.
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Tanasijczuk, A. J., D0, & et al. (2008). Measurement of the Differential Cross-Section for the Production of an Isolated Photon with Associated Jet in $p \bar{p}$ Collisions at $\sqrt{s}$ = 1.96-TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 666, 435. https://doi.org/10.1016/j.physletb.2008.06.076 (Original work published 2008)