Speaker
Xu Weiran for the KATRIN Collaboration
(MIT)
Description
The Karlsruhe Tritium Neutrino (KATRIN) experiment has pushed the measurement of absolute neutrino mass scale down to the sub-eV region for the first time. The $\beta$ electrons from molecular tritium decay are measured with high precision, using the magnetic adiabatic collimation with an electrostatic filter (MAC-E filter). A blind analysis for the first two scientific campaigns of KATRIN sets the most stringent upper limit of $m_{\nu}$ < 0.8eV/c$^2$ at a 90% confidence level. This new result of a direct neutrino mass measurements provides a key input to cosmological models and the theory of particle physics.
