Search for Magnetic Monopoles and Stable High-Electric-Charge Objects in 13 TeV Proton-Proton Collisions with the ATLAS and MoEDAL Detectors

Anthony Eric Lionti, Tobias Golling, Philippe Mermod
<span title="">2020</span>
THÈSE présentéeà la Faculté des sciences de l'Université de Genève pour obtenir le grade de Docteurès sciences, mention physique par Anthony Lionti de Aix-en-Provence (France) Thèse N • 5505 GENÈVE Atelier d'impression ReproMail 2020 Ionising Particles (HIP). Cette thèse se concentre sur la recherche des HIPs et en particulier du monopole magnétique avec deux détecteurs distincts, le détecteur ATLAS et le piègeà monopole du détecteur MoEDAL, de l'anglais Monopole and Exotics Detector At the LHC
more &raquo; ... (MoEDAL). Les deux analyses portent sur les collisions proton-proton du LHC avec uneénergie au centre de masse de 13 TeV. Ces analyses sont la suite naturelle des recherches précédentes réaliséesà plus faiblesénergies, conséquences de l'incertitude théorique sur la masse du monopole magnétique. i ii Abstract Particle physics is the branch of physics that postulates that matter and radiation are made of elementary particles and studies those particles and their interactions. It is modelled by the Standard Model (SM) of particle physics whose current formulation was finalised in the 1970s. Properties predicted by the Standard Model have been measured with high accuracy in numerous high energy physics experiments and the confirmation of the existence of the particles included into the model contributed to its success. In order to reach very high energy levels and observe evidences of the model predictions, large scale international experiments were designed. The Large Hadron Collider (LHC) is the world's largest and highest energy particle collider with a design energy at centre of mass of 14 TeV and a 27 kilometres circumference. It is responsible for the discovery of the Higgs boson in 2012, last missing particle predicted by the Standard model, detected by both the Compact Muon Solenoid (CMS) detector and the A Toroidal LHC ApparatuS (ATLAS) detector. Despite the indisputable success of the Standard Model of particle physics, many fundamental known aspects of nature cannot be explained by it. The dark matter for example cannot be accommodated into the Standard Model, similarly it cannot explain the matter-antimatter asymmetry, or the neutrino oscillations and hence their existence as massive particles. Naturally models attempting to formalise possible solutions to the standard model limitations were developed and are known as physics Beyond the Standard Model (BSM). Experimentalists in particle physics are searching for new physics and confirmation of a BSM model. One of the long-time search for new physics is the search for a magnetic monopole, never observed in nature while theoretically justified and hypothetical symmetric equivalent of the electric charge. Magnetically charged particles, such as the magnetic monopoles or the dyons, would interact strongly with matter and are known as Highly Ionising Particles (HIP). This thesis focus on the search of HIPs and in particular the magnetic monopole with two distinct detectors, the ATLAS detector and the Monopole and Exotics Detector At the LHC (MoEDAL) magnetic monopole trapping array. Both analyses were done with LHC proton-proton collisions with an energy at centre of mass of 13 TeV. Those analyses are the natural continuations of previous searches done at lower energies resulting of the unknown theoretical mass of the magnetic monopole. iii iv Dedicatioǹ A mamie, ma plus fervente supportrice. A Huan, ma femme, ma plus belle découverte de cette aventure.
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