Despite its spectacular successes, the Standard Model (SM) of particle physics has well-known limitations. Understanding what lies beyond the SM is one of the major challenges of contemporary fundamental physics. In recent years, flavour physics and in particular the study of rare B-meson decays, has revealed deviations from the predictions of the SM. These “flavour anomalies” have attracted strong interest, as they could represent the first indirect signs of New Physics. The internship project aims to explore these deviations in two steps: - Perform precise calculations within the Standard Model for the relevant decays, - Carry out a study of a theoretical New Physics scenario capable of modifying these processes and potentially accounting for the observed deviations. Depending on the candidate’s interests, the project may also include a more involved programming component to complement the analytical approach. This project will allow the intern to gain experience with analytical and numerical tools used in particle physics, to develop skills in theoretical calculations while maintaining a link with phenomenological aspects, and to take part in a research topic at the forefront of current investigations.