Neutrino mass limit and final analysis of the first tritium spectrum recorded with CRES

The Project 8 collaboration aims for a direct measurement of the absolute neutrino mass scale from the distortion of the tritium decay spectrum near the endpoint. To this end, the collaboration has successfully established Cyclotron Radiation Emission Spectroscopy (CRES), a frequency-based approach for measuring the energy of electrons emitted in decays. To meet the goal of a final sensitivity of 40meV/c2, Project 8 has divided the development of the experiment into four phases with Phase II data collection completed in 2020. In this talk, I will present the recently published final analysis of the first tritium spectrum recorded with the Phase II CRES prototype. We have performed a Bayesian and a frequentist analysis on the tritium data, which independently determine limits on the neutrino mass. These limits are in excellent agreement with each other and with the sensitivity of the Phase II experiment. In this talk, I will focus on the frequentist analysis and provide an outlook on how the Phase II analysis informs the future of Project 8.