Neutrino Mass in the Crosshairs

N eutrinos are at least 600,000 times lighter than the next-lightest elementary particle—the electron—but their exact mass remains unknown. Pinning down this mass would help refine both the standard model of particle physics and cosmology theories. Now the Project 8 Collaboration presents the first neutrino-mass constraint derived from a frequency-based technique [1, 2]. The team’s findings demonstrate the potential of such a technique for future neutrino-mass experiments.