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This thesis provides an introduction to the physics of the Standard Model and beyond, and to the methods used to analyse Large Hadron Collider (LHC) data. The 'hierarchy problem', astrophysical data and experiments on neutrinos indicate that new physics can be expected at the now accessible TeV scale. This work investigates extensions of the Standard Model with gravitons and gravitinos (in the context of supergravity). The production of these particles in association with jets is studied as one of the most promising avenues for researching new physics at the LHC. Advanced simulation techniques and tools, such as algorithms allowing the computation of Feynman graphs and helicity amplitudes are first developed and then employed.

Large Hadron Collider (France and Switzerland) --- Particles (Nuclear physics) --- Standard model (Nuclear physics) --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Large Hadron Collider --- Physics. --- Mathematical physics. --- Quantum field theory. --- String theory. --- Cosmology. --- Elementary particles (Physics). --- Elementary Particles, Quantum Field Theory. --- Quantum Field Theories, String Theory. --- Mathematical Physics. --- Nuclear models --- Nuclear reactions --- Nuclear physics --- Hadron colliders --- Supercolliders --- Quantum theory. --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Physics --- Mechanics --- Thermodynamics --- Physical mathematics --- Astronomy --- Deism --- Metaphysics --- Models, String --- String theory --- Relativistic quantum field theory --- Field theory (Physics) --- Quantum theory --- Relativity (Physics) --- Mathematics

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This thesis deals with two main procedures performed with the ATLAS detector at the Large Hadron Collider (LHC). The noise description in the hadronic calorimeter TileCal represents a very valuable technical job. The second part presents a fruitful physics analysis – the cross section measurement of the process p + p → Z0 → τ + τ. The Monte Carlo simulations of the TileCal are described in the first part of the thesis, including a detailed treatment of the electronic noise and multiple interactions (so-called pile-up). An accurate description of both is crucial for the reconstruction of e.g. jets or hadronic tau-jets. The second part reports a Standard Model measurement of the Z0 → τ + τ process with the emphasis on the final state with an electron and a hadronically decaying tau-lepton. The Z0 → τ + τ channel forms the dominant background in the search for Higgs bosons decaying into tau lepton pairs, and thus the good understanding achieved here can facilitate more sensitive Higgs detection.

Physics --- Physical Sciences & Mathematics --- Atomic Physics --- Nuclear Physics --- Nuclear track detectors. --- Large Hadron Collider (France and Switzerland) --- Large Hadron Collider --- Detectors, Nuclear track --- Particle track detectors --- Track detectors, Nuclear --- Physics. --- Quantum field theory. --- String theory. --- Elementary particles (Physics). --- Physical measurements. --- Measurement. --- Elementary Particles, Quantum Field Theory. --- Measurement Science and Instrumentation. --- Quantum Field Theories, String Theory. --- Hadron colliders --- Supercolliders --- Nuclear counters --- Nuclear emulsions --- Particle tracks (Nuclear physics) --- Quantum theory. --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Mechanics --- Thermodynamics --- Measurement   . --- Models, String --- String theory --- Nuclear reactions --- Measuring --- Mensuration --- Mathematics --- Technology --- Metrology --- Physical measurements --- Measurements, Physical --- Mathematical physics --- Measurement --- Relativistic quantum field theory --- Field theory (Physics) --- Quantum theory --- Relativity (Physics) --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Nuclear physics