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Jet calibration, cross section measurements and New Physics searches with the ATLAS experiment within the Run 2 data

Abstract : The Standard Model is the current theory used to describe the elementary particles and their fundamental interactions (except the gravity). My PhD within the ATLAS experiment put this model under test using objects called jets, to study final state particles that interact through the strong force. First, I contributed to a method of jet calibration aiming at calibrating the energy scale of jets in the forward region of the detector with respect to central region. I improved the calibration by making it faster and more precise. Next, I worked on a search analysis of new physics using events with two jets. The Standard Model predicts a smooth distribution of the invariant mass of di-jets, hence we search for a bump which could come from a new particle. Since no significant bump is found, we put limits on signals as predicted by Beyond Standard Model theories and on model-independent signals. Last, I developed a new physics analysis measuring the leading (highest in transverse momentum) jet differential cross-section as a function of transverse momentum and rapidity. The challenge was to factorize the detector effects (resolution and acceptance) from the observable, which I did using a new unfolding technique. I also worked on the theoretical predictions calculation which was very challenging to perform and needed the implementation of special regularizations. The measurement and the predictions are then compared and tensions are observed due to the difficulties of theoretical predictions calculation.
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Submitted on : Friday, September 17, 2021 - 3:24:09 PM
Last modification on : Tuesday, September 28, 2021 - 5:17:11 PM


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  • HAL Id : tel-03347852, version 1


Robert Hankache. Jet calibration, cross section measurements and New Physics searches with the ATLAS experiment within the Run 2 data. Nuclear Experiment [nucl-ex]. Sorbonne Université, 2019. English. ⟨NNT : 2019SORUS610⟩. ⟨tel-03347852⟩



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