Jet cross sections and PDF constraints

A measurement of inclusive jet and dijet production cross sections is presented. Data from LHC proton-proton collisions at $\sqrt{s}=7\TeV$, corresponding to $4.67\fbinv$ of integrated luminosity, have been collected with the CMS detector. Jets are reconstructed with the anti-$k_T$ clustering algorithm of size parameter $R=0.7$, extending to rapidity $|y|=2.5$, transverse momentum $\pt=2\TeV$, and dijet invariant mass $M_{JJ}=5\TeV$. The measured cross sections are corrected for detector effects and compared to perturbative QCD predictions at next-to-leading order, using various sets of parton distribution functions.