Simulation of the Measurement of the Inclusive Jet Cross Sections in Z($e^{+}e^{-} \to \mu^{+}\mu^{-}$)+jets Events in pp Collisions at 14TeV with the ATLAS experiment

This PhD. thesis presents the measurement of the inclusive jet cross section in Z->ee and in Z->mumu events, comparing theory predictions with "real data", i.e. Monte Carlo fully-reconstructed events, for the first 1fb-1 of data at the ATLAS detector. Reconstructed corrected data is compared to next-to-LO (NLO) and LO pQCD predictions. Perturbative predictions are corrected for the contributions of the non-perturbative processes, like the underlying event and the fragmentation of the partons into jets of hadrons. These processes are not described by perturbative theory and must be estimated using phenomenological models. Two different reconstructed data are used, PYTHIA and ALPGEN Monte Carlo data. Comparisons of both Monte Carlo predictions are studied. Background processes are estimated proposing different data-driven methods to be applied to real data. ATLAS Cone 0.4 algorithm is used to look for jets in the events after identifying the presence of a Z boson through the reconstruction of its decay (electrons or muons). Reconstructed data is corrected for detector effects, using independent factors.