Richard Bonventre (LBNL) "Investigating Lepton Flavor and Number Violation with the Mu2e and SNO+ Experiments"

Abstract:
Neutrino oscillation measurements have shown that lepton flavor is not conserved, and that the standard model must be extended to include neutrino mass. Neutrino-less double beta decay measurements will help understand the nature and origin of neutrino mass, while searches for charged lepton flavor violation will probe whether there is additional flavor-related physics beyond the standard model.
The SNO+ experiment will employ 780 tons of liquid scintillator loaded with 1.3 tons of 130Te for a low-background and high-isotope-mass search for neutrino-less double beta decay. SNO+ will run in multiple phases with different target materials, allowing it to additionally study geo- and reactor neutrinos, solar neutrinos, and search for invisible modes of nucleon decay. First results from the SNO+ water phase will be presented. The Mu2e experiment will search for the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. Mu2e will improve the previous measurement by four orders of magnitude, reaching a 90% C.L. sensitivity to CLFV conversion rates of 8 × 10−17 or larger. The experiment is sensitive to a wide range of new physics at high mass scales, complementing direct searches at colliders. Mu2e is under design and construction at the Muon Campus of Fermilab; we expect to start taking physics data in 2023.