#StudentSeminar: Neutrinos as a window into weakly coupled new physics

by Rebeca Beltrán Lloría (IFIC - CSIC/UV)

Thursday 15 May 2025, 15:00 → 16:30 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

This seminar explores how sterile neutrinos can serve as powerful probes of new physics beyond the SM. These particles are well motivated by neutrino mass models, such as the seesaw mechanism, which explains the smallness of active neutrino masses by introducing heavy sterile states. To describe their possible interactions with SM particles in a systematic and model-agnostic way, I will use the framework of effective field theories (EFTs), focusing on the SM EFT extended with sterile neutrinos (NRSMEFT). In scenarios with very small couplings, these interactions can lead to striking long-lived particle (LLP) signatures at colliders. I will present results from my PhD research on the collider phenomenology of various NRSMEFT operators, and show how LLP searches at the LHC and future far detectors can probe previously unexplored regions of parameter space. This work illustrates how combining EFT tools with novel search strategies opens new avenues to uncover weakly coupled new physics.

Rebeca_StudentSeminar_v2.pdf