Theory seminar (11am): Kare Fridell: Lepton number violating phenomenology

Thursday 2 May 2024, 11:00 → 12:00 Europe/Amsterdam

Colloquium Room

Lepton number violation (LNV) is a central component in theories of  leptogenesis and Majorana neutrino masses, yet it has never been  observed experimentally. In this talk I will review the most promising  observables of LNV from an effective field theory (EFT) perspective, including meson decays and colliders. I will then show why EFT is not well-suited to describe constraints coming from small neutrino masses, and instead derive new constraints using simplified models. The results of this latter analysis can be used as a phenomenological tool to connect many different New Physics models to neutrino masses, which I will demonstrate using the recently reported excess in rare B-meson decays at Belle II.