Étude des gerbes hadroniques dans un calorimètre à grande granularité et étude du canal e+e- → HZ (Z → qq) dans les futurs collisionneurs leptoniques

Abstract : The future International Linear Collider ILC is a project of a leptonic collider which aims to continue the physical program of the LHC. Using this collider, it will be possible to precisely measure the properties of the Higgs Boson, discovered in 2012 at the LHC. Two particle detectors are planned to equip the colliding point of the ILC, the International Large Detector ILD, and the Silicon Detector SiD. These two detectors are designed with the prospect of using particle flow algorithms. This innovative technique can improve the reconstruction and energy measurement of the jets. To apply these particle flow algorithms, highly granular calorimeters have to be used. The semi-digital hadronic calorimeter SDHCAL is proposed to equip the International Large Detector. This calorimeter uses Glass Resistive Plate Chambers as the active part. The readout is done using 1cm x 1cm channels. A prototype has been developed in 2011, mainly at the Institut de Physique Nucléaire de Lyon, and regularly exposed to muons, electrons and hadrons beams at CERN. During this thesis, I mainly worked on the SDHCAL simulation program. Using the data taken in October 2015, I could improve the algorithm which simulates the response of the Glass Resistive Plate Chambers used in the prototype. A comparison of the topology of the electromagnetic and hadronic showers from data and simulation will be presented. Another part of this thesis is focused on the energy reconstruction of the hadronic showers in the SDHCAL. By using the SDHCAL simulation, I could study the impact of the electromagnetic component on the energy estimation of the hadronic showers, from which I could propose an alternative method for reconstructing the energy, which improves the performance of the SDHCAL. I could also study the impact of using a more advanced readout electronics on the energy estimation
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Guillaume Garillot. Étude des gerbes hadroniques dans un calorimètre à grande granularité et étude du canal e+e- → HZ (Z → qq) dans les futurs collisionneurs leptoniques. Physique Nucléaire Expérimentale [nucl-ex]. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSE1013⟩. ⟨tel-02141420⟩

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