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Description
Title:
Search for long-lived particles within the ATLAS detector, development of an analysis preservation method, and contributions to the high-granularity timing detector
Abstract:
The Standard Model (SM) provides the most successful description of elementary particles and their interactions to date. However, several fundamental observations, such as the nature of dark matter, the origin of neutrino masses, and the observed baryon asymmetry of the Universe, remain unexplained. These open questions strongly motivate the search for new particles and interactions beyond the SM (BSM). The Large Hadron Collider (LHC), through its highly energetic proton-proton (pp) collision provides a unique opportunity to probe such scenarios. Among the many proposed BSM scenarios are those predicting weakly coupled and long-lived particles (LLPs), which have long escaped traditional collider search programs.
This thesis is primarily devoted to the search for LLPs within the ATLAS experiment at the LHC, while also contributing to the ongoing ATLAS detector upgrades in preparation for the upcoming High-Luminosity LHC (HL-LHC) era. More specifically, the work is organized around three complementary contributions: a search for long-lived axion-like particles (ALPs) produced in exotic Higgs boson decays; the development of a novel preservation and reinterpretation framework based on machine-learning techniques, known as surrogate models (SuMos); and contributions to the High-Granularity Timing Detector (HGTD) as part of the HL-LHC upgrade, including the development of its data-acquisition (DAQ) software, and its integration into the ATLAS Trigger and Data Acquisition (TDAQ) system.
Remote connection:
For those unable to join in person, a Microsoft Teams connection will be provided shortly prior to the defense time.
Jury:
The details of these contributions and their significance for the ATLAS physics program, and to physics at large, will be examined by the following jury:
| Jean Orloff | Professeur des Universités | LPCA, Clermont | Examinateur |
| Sabine Kraml | Directrice de Recherche | LPSC, Grenoble | Rapporteuse |
| Caroline Collard | Directrice de Recherche | IPHC, Strasbourg | Rapporteuse |
| Emille E. O. Ishida | Ingénieure de Recherche | LPCA, Clermont | Examinatrice |
| Thomas Strebler | Chargé de Recherche | CPPM, Marseille | Examinateur |
| Angela M. Burger | Chargée de Recherche | L2IT, Toulouse | Examinatrice |
| Luca Cadamuro | Chargé de Recherche | IJCLab, Paris | Examinateur |
| Louie D. Corpe | Professeur junior | LPCA, Clermont | Directeur de thèse |