 (GeV) T p 50 60 100 200 300 400 dy (pb/GeV) T /dp 2 d -6 10$^{-5}$ 10$^{-4}$ 10$^{-3}$ 10$^{-2}$ 10$^{-1}$ 10 1 10 2 10$^{3}$ 10$^{4}$ 10$^{5}$ 10$^{6}$ 10$^{7}$ 10  |y|<0.4 (x32)  0.4<|y|<0.8 (x16)  0.8<|y|<1.2 (x8)  1.2<|y|<1.6 (x4)  1.6<|y|<2.0 (x2)  2.0<|y|<2.4  = 1.96 TeV s -1 L = 0.70 fb  = 0.7 cone R NLO pQCD +non-perturbative corrections T  = p F  =  R CTEQ6.5M 600 DØ Run II 0.5 1.0 1.5 |y| < 0.4 DØ Run II -1 L = 0.70 fb  = 0.7 cone R 50 100 200 300 0.0 0.5 1.0 1.5 1.2 < |y| < 1.6 NLO scale uncertainty  0.4 < |y| < 0.8 T  = p F  =  R NLO pQCD +non-perturbative corrections 50 100 200 300 1.6 < |y| < 2.0 CTEQ6.5M with uncertainties MRST2004 0.8 < |y| < 1.2 Data Systematic uncertainty 50 100 200 300 2.0 < |y| < 2.4 (GeV) T p data / theory FIG. 3: (top) DØ’s observed inclusive jet differential cross sections corrected to the particle level in six rapidity regions compared to next to leading order (NLO) QCD predictions [48]. The NLO QCD predictions are calculated with the CTEQ6.5M parton distribution functions; (bottom) ratios of the measured cross sections over the NLO QCD predictions. The data agrees with the theory quite well and has remarkably small systematic uncertainties. with a muon trigger which did not rely on calorimeter activity. These different jet triggers were combined to form the full p$_{T}$ spectrum with each trigger contributing to a unique p$_{T}$ range. Only those data for which the trigger efficiency is > 98% are used. The events were required to have a reconstructed primary vertex and the position of the p ¯ p interaction be within 50 cm of the detector center along the beam direction. This requirement ensured that the jets follow the projective geometry of the calorimeter and thus their energy was accurately measured. The consequence of this requirement was a reduction of only 7 . 0 ± 0 . 5% in the integrated luminosity. The primary vertex was reconstructed using charged particle tracks measured using silicon micro-strip and scintillating fiber detectors located inside a solenoidal magnetic field of 2 T [12]. 17