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<dc:title xml:lang="en">Search for new physics using radiative B meson decays and lifetime measurment of the B meson with the Belle II experiment</dc:title>
<dcterms:alternative xml:lang="fr">Recherche de nouvelles physiques grâce à la désintégration radiative de mésons B et mesure de leur temps de vie avec l’expérience Belle II</dcterms:alternative>
<dc:subject xml:lang="fr">La violation de CP</dc:subject>
<dc:subject xml:lang="fr">Collisionneur électron-positron</dc:subject>
<dc:subject xml:lang="fr">SuperKEKB</dc:subject>
<dc:subject xml:lang="fr">L’expérience Belle II</dc:subject>
<dc:subject xml:lang="fr">Asymétrie</dc:subject>
<dc:subject xml:lang="fr">La durée de vie</dc:subject>
<dc:subject xml:lang="fr">Le plus lumineux au monde</dc:subject>
<dc:subject xml:lang="fr">Méson B</dc:subject>
<dc:subject xml:lang="en">CP violation</dc:subject>
<dc:subject xml:lang="en">Electron-Positron Collisions</dc:subject>
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<dcterms:abstract xml:lang="fr">Juste après le Big Bang, matière et antimatière étaient présentes en quantités égales. Mais l’univers que nous observons aujourd’hui est presque entièrement constitué de matière. Une différence de comportement des particules et anti-particules constitue un ingrédient fondamental pour expliquer cette disparition. La violation de la symétrie quantique CP (Charge et Parité) introduit une telle asymétrie, cependant le niveau observé actuellement pour cette violation ne suffit quantitativement pas. L’expérience Belle II vient de démarrer au Japon, elle permet d’étudier avec une très grande précision des systèmes particules/anti-particules produits par le collisionneur électron-positron SuperKEKB , qui sera bientôt le plus lumineux au monde. Dans mon doctorant, J'ai travaillé sur la mesure de la violation de CP dans les désintégrations radiatives du méson B (désintégrations avec des photons à l'état final) particulièrement prometteuses grâce à leur haute sensibilité aux possibles nouveaux processus. Suite à cette analyse, j'ai commencé une nouvelle mesure de la durée de vie des mésons B, pour vérifier la robustesse des outils utilisés pour mesurer la violation de CP.</dcterms:abstract>
<dcterms:abstract xml:lang="en">After the Big Bang matter and antimatter were present in equal amounts. Today, however, everything we see, is made almost entirely of matter. A fundamental ingredient to explain this asymmetry between matter and antimatter is the violation of the CP (Charge Parity) symmetry. CP violation has been observed but quantitatively not enough to explain the huge asymmetry. The Belle II experiment in Japan studies the particles produced in electron-positron collisions at the SuperKEKB collider, the highest intensity collider in the World, allowing a high precision measurements of the known sources of CP violation and looking for new ones. In my PhD, I worked on measuring the CP violation in B meson radiative decays (decays with photon in final state) particularly promising thanks to their high sensitivity to possible new processes. Following this analysis, I started a new measurement of the B mesons lifetime where I could verify the robustness of the tools used in the CP violation measurement.</dcterms:abstract>
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