Internship opportunity in Theoretical Particle Physics at IP2I Lyon. Topic: For nearly four decades, the Higgs boson has inspired extensions to the Standard Model aimed at explaining its unnaturally light mass within the context of effective field theories. These extensions typically predict the existence of new particles that should be accessible at the Large Hadron Collider (LHC). However, the absence of experimental evidence for such particles poses a significant challenge to conventional approaches addressing this issue. This internship is embedded within a research program that explores modifications to the Higgs sector to achieve ultraviolet-infrared mixing, thereby providing an explanation for why new physics may emerge at higher energy scales than those envisioned in traditional models. The internship is designed as a precursor to doctoral studies, offering a pathway to a PhD. More details in the attached file.