Measurement of The Differential Inclusive Jet Cross Section at 7 TeV In The CMS Detector

In this thesis, measurement of inclusive jet cross section is presented. Data from LHC proton-proton collisions at 7 TeV, corresponding to approximately 5.0 fb-1 of integrated luminosity, have been collected by the CMS detector. Particle Flow jets with cone radius parameter R = 0.7 are reconstructed up to rapidity bin 2.5 and transverse momentum 2000 GeV using the anti-kT clustering algorithm. The measured cross sections are corrected for detector effects and compared to perturbative QCD predictions at next-to-leading order, using five sets of parton distribution functions corrected by non-perturbative effects. Measured inclusive jet cross sections and theoretical predictions are showen to be in a good agreement. We also measured the cross sections with cone size 0.7 in 2011 and compared the data with the cross sections data with cone size 0.5 collected in 2010. We found that the spectra are in good agreement despite the differences in their radii and jet energy scale uncertainties.