Denis Carabadjac soutient sa thèse

le lundi 22 septembre 2025 à 14h00 dans l’amphi Becquerel de l’École polytechnique

Vers la mesure de la violation de la symétrie CP dans les oscillations des neutrinos

My doctoral research has been devoted to neutrino oscillations and the future of long-baseline experiments. Neutrinos are among the most elusive particles in the universe, yet their study can provide unique insight into some of the most fundamental questions in physics. Two of the most pressing ones are : What is the ordering of neutrino masses ? Do neutrinos violate Charge-Parity symmetry, potentially helping us understand why the universe is made of matter rather than antimatter ?
In the first part of my thesis, I present results from the T2K experiment in Japan. I performed the final stage of the oscillation analysis and developed new statistical methods to strengthen the robustness of the extracted oscillation parameters.
In the second part of my work, I focus on the ambitious program of the Hyper-Kamiokande experiment, the next-generation neutrino observatory in Japan. I carried out the first official sensitivity studies using accelerator neutrinos and reported the projected capabilities of Hyper-Kamiokande in precisely measuring oscillation parameters. I will also report on the capabilities of the HKROC readout electronics, which I have tested extensively. I was involved in all stages of setup, analysis, and validation, and the results demonstrated that HKROC delivers sub-nanosecond timing resolution and precise charge measurements across a wide dynamic range, confirming its suitability for the next generation of PMT-based detectors.
Through this research, I contributed to fundamental physics, advanced statistical methodology, and detector technology, providing input to the international effort aimed at unraveling the mysteries of neutrinos.