Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 99: Hauptvorträge (Invited Talks) IV
T 99.1: Invited Talk
Friday, March 19, 2021, 09:45–10:30, Audimax
Probing the neutrino mass scale with the KATRIN experiment — •Kathrin Valerius — Karlsruhe Institute of Technology, Institute for Astroparticle Physics, Karlsruhe, Germany
Precision measurements of the kinematics of weak decays offer a direct and nearly model-independent approach to probe the absolute neutrino mass scale. The KArlsruhe TRItium Neutrino experiment (KATRIN) is searching for the minute imprint of the neutrino mass in the endpoint region of the tritium beta-decay spectrum. KATRIN employs a high-intensity gaseous molecular tritium source and a high-resolution electrostatic filter with magnetic adiabatic collimation to target a neutrino-mass sensitivity of 0.2 eV/c2, thus improving on previous experiments by an order of magnitude, after five years of data-taking.
With just its first science run, KATRIN has tightened previous direct neutrino mass bounds by about a factor of two, yielding a new upper limit of 1.1 eV/c2 (90% CL), and has begun to address further science channels such as the direct search for light sterile neutrinos. As larger data sets are collected and further improvements in terms of signal-to-background ratio and systematics are being achieved, KATRIN is continuing along its path towards sub-eV neutrino-mass sensitivity and the exploration of interesting BSM physics cases.