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T: Fachverband Teilchenphysik

T 75: Neutrino physics without accelerators VI

T 75.4: Vortrag

Donnerstag, 2. April 2020, 17:20–17:35, H-HS XIII

Analysis of First KATRIN Neutrino Mass Data using Monte Carlo Propagation — •Christian Karl for the KATRIN collaboration — Max-Planck-Institut für Physik — Technische Universität München

The KATRIN experiment is designed to measure the effective electron anti-neutrino mass m_ν by investigating the energy spectrum of tritium beta-decay. The first neutrino mass measurement took place in spring 2019. For this first period, the source activity was set to about 22 % of the nominal value and around two million electrons were collected in the region of interest. This corresponds to an effective measurement time of five days at full source activity. Nevertheless, this data was used to improve existing laboratory limits and allowed to advance the analysis tools for forthcoming high-statistics data sets.

This talk presents one of the analysis strategies pursued which is based upon Monte Carlo propagation of uncertainties. A fit to the data including all dominant systematic effects leads to a best-fit value of m_ν² = −1.0_−1.1^+0.9 eV². From this we derive an upper limit of m_ν < 1.1 eV at 90 % confidence level using the sensitivity limit method of Lokhov and Tkachov.