Bonn 2020 – wissenschaftliches Programm
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HK 28.3: Vortrag
Mittwoch, 1. April 2020, 14:45–15:00, J-HS B
Treatment of systematic uncertainties in the KATRIN neutrino mass analysis — •Leonard Köllenberger for the KATRIN collaboration — Institute for Nuclear Physics, Karlsruhe Institute of Technology
The KATRIN collaboration aims to determine the neutrino mass with a sensitivity of 0.2 eV/c2 (90 % CL). This will be achieved by measuring the endpoint region of the tritium β-decay spectrum.
KATRIN’s first science run led to an improved upper limit of 1.1 eV (90 % CL) on the neutrino mass, with statistics-dominated uncertainties. Collecting more data in future measurement campaigns will increase the importance of the systematic error contribution.
Several approaches to account for systematic uncertainties can be applied within the analysis.
Among these are the use of pull terms, the covariance matrix method, Monte Carlo propagation, and Markov Chain Monte Carlo (MCMC).
A comparative discussion of these approaches will be presented. The MCMC approach is used in the KaFit framework and is investigated for treatment of systematics in future neutrino mass analysis.
This work is supported by the Helmholtz Association (HGF), the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), and the Helmholtz Young Investigator Group (VH-NG-1055).