Implications of the Tevatron Jet Results on Pdf

We report a new measurement of the pseudorapidity (η) and transverse-energy (E_T) dependenceof the inclusive jet production cross section in pbar p collisions at √ {s} =1.8 TeV using 95 pb^-1 of data collected with the DØ detector at the Fermilab Tevatron. The differential cross section d²σ/(dE_Tdη) is presented up to |η| = 3, significantly extending previous measurements. The results are in good overall agreement with next-to-leading order predictions from QCD, indicate a preference for certain parton distribution functions, and provide the world's best constraint on the gluon distribution at high parton momentum fraction x.