data are in good agreement with the theoretical predictions. The experimental uncertainty, dominated by the jet energy scale uncertainty, is comparable to the theoretical uncertainty which is dominated by the PDF uncertainty.  (GeV/c) JET T p 0 100 200 300 400 500 600 700 (GeV/c) nb T dYdp 2 d -14 10$^{-11}$ 10 -8 10$^{-5}$ 10$^{-2}$ 10 10 4 10$^{7}$ 10 10 10$^{13}$ 10 ) 6 |y|<0.1 (x10 ) 3 0.1<|y|<0.7 (x10 0.7<|y|<1.1 ) -3 1.1<|y|<1.6 (x10 ) -6 1.6<|y|<2.1 (x10 =0.75 merge Midpoint: R=0.7, f ) -1 CDF data (1.13 fb Systematic uncertainty NLO pQCD 0 100 200 300 400 500 600 700 0.5 1 1.5 2 2.5 3 3.5 |y|<0.1 50 100 150 200 0.8 1 1.2 1 2 3 1.1<|y|<1.6 50 100 150 200 0.8 1 1.2 0 100 200 300 400 500 600 700 Data / Theory 0.5 1 1.5 2 2.5 3 3.5 0.1<|y|<0.7 50 100 150 200 0.8 1 1.2  (GeV/c) JET T p 50 100 150 200 250 300 350 400 450 0.5 1 1.5 2 2.5 3 3.5 1.6<|y|<2.1 50 100 150 0.8 1 1.2  (GeV/c) JET T p 0 100 200 300 400 500 600 700 0.5 1 1.5 2 2.5 3 3.5 0.7<|y|<1.1 50 100 150 200 0.8 1 1.2 ) / NLO -1 CDF Data (1.13 fb PDF Uncertainty MRST 2004 / CTEQ6.1M Systematic uncertainty Including hadronization and UE =0.75 merge Midpoint: R=0.7, f FIG. 4: (left) CDF’s observed inclusive jet differential cross sections corrected to the particle level in five rapidity regions compared to next to leading order (NLO) QCD predictions [46]. The NLO QCD predictions are calculated with the CTEQ6.1M parton distribution functions. (right) Ratios of the measured cross sections over the NLO QCD predictions. The theory describes the data quite well. B. Measurement using the k$_{T}$ Clustering Algorithm The k$_{T}$ clustering algorithm, which combines objects in pairs to reconstruct a jet, is infra- red and collinear safe at all orders in perturbation theory and is preferred over iterative cone algorithms. The CDF collaboration has measured [47] the inclusive jet cross section using the k$_{T}$ clustering algorithm with D = 0 . 4 , 0 . 7 , and 1.0 using 1.0 fb − 1 of data in the same rapidity region as used in the cone-based analysis [46]. The analysis procedure is similar to the one described in Section V A 2, except the correction for multiple-interactions which are determined using a novel approach. The measured jet transverse momenta are corrected for this effect by removing a certain amount of transverse momentum, δ mi p T × ( N$_{V}$ − 1) where N$_{V}$ denotes the number of primary vertices in the event. The value of δ mi p T was determined by requiring the shape of the p$_{T}$ spectrum at high instantaneous luminosity ( L $^{inst}$) to be the 21