Cyclotron Radiation Emission Spectroscopy and results from Phase II of the Project 8 neutrino mass experiment*

Measurements of the β^- spectrum of tritium give the most precise directly measured limits on neutrino mass. Cyclotron Radiation Emission Spectroscopy (CRES) is a new experimental technique that has the potential to surmount the systematic and statistical limitations of current-generation direct measurement methods and reach an effective electron antineutrino mass sensitivity of ∽40 meV/c². I will introduce CRES and report on Phase II of Project 8's neutrino mass experiment, including the Bayesian and frequentist analyses leading to its first tritium endpoint and neutrino mass limit results. I will also discuss our stringent background limit, with no events detected above the endpoint, and our demonstration of high resolution.