Searching for New Physics through the Neutrino (bag)pipe

Daniel Naredo Tuero PhD dissertation

Searching for New Physics through the Neutrino (bag)pipe

Venue&Time: Red Room / 11:00

Abstract:
Among the many open problems that plague the Standard Model (SM) of particle physics, the massive nature of neutrinos stands out as it is one of the few indications of New Physics that we have observed in our terrestrial laboratories, as supported by the phenomenon of neutrino flavour oscillations. Neutrinos offer a rich phenomenological and complementary programme, from laboratory signals to cosmological imprints, as we will explore in this Thesis. First, we will assess the status of the cosmological neutrino mass bound in light of the latest results from DESI, identifying the features and tensions in the data that are driving this ever-tightening constraint. Second, we will consider the inclusion of heavy Majorana right-handed neutrinos, the most economical SM extension to generate neutrino masses. In particular, we will show how it is possible to constrain heavy neutrinos above the electroweak scale by harnessing their effects on precision observables. Lastly, we will investigate the role of neutrino data in the global fit of the SM Effective Field Theory (SMEFT), showing that the inclusion of neutrino oscillation and scattering data can add new valuable information.

Supervisores: Enrique Fernández-Martínez y Xabier Marcano