2013/08/12 by D Collaboration, D0 Collaboration
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.1308.2708
22 pages, 10 figures, Submitted to Phys. Rev. D
arxiv created 2013/08/12 · arxiv updated 2013/08/14
We study the process of associated photon and jet production, p+pbar --> photon + jet + X, using 8.7 fb-1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider at a center-of-mass energy sqrts=1.96 TeV. Photons are reconstructed with rapidity |ygamma| <1.0 or 1.5<|ygamma| < 2.5 and transverse momentum pTgamma GeV. The highest-pT jet is required to be in one of four rapidity regions up to |yjet|< 3.2. For each rapidity configuration we measure the differential cross sections in pTgamma separately for events with the same sign (ygamma yjet>0) and opposite sign (ygamma yjet<=0) of photon and jet rapidities. We compare the measured triple differential cross sections, d3 sigma / d pTgamma ygamma yjet, to next-to-leading order (NLO) perturbative QCD calculations using different sets of parton distribution functions and to predictions from the SHERPA and PYTHIA Monte Carlo event generators. The NLO calculations are found to be in general agreement with the data, but do not describe all kinematic regions.