Abstract
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to search for the effective electron antineutrino mass with a sensitivity of 0.2 eV/c2 (90% C.L.) from the shape of the tritium β-decay electron energy spectrum. The first measurement campaign in KATRIN dedicated to the neutrino mass took place in spring 2019 with about 22 % of the nominal tritium activity. The goal of this pilot measurement was to reach a sensitivity competitive with past results while establishing a robust bias-free analysis and good initial understanding of systematic effects. Several different analysis techniques were developed independently and cross-checked on a set of fake Monte Carlo prior to real spectra. In this paper, I present an overview of the KATRIN analysis strategies and discuss their applications on the tritium spectra. The treatment of systematic effects is also discussed in detail. I conclude with a short outlook for the future neutrino mass measurement campaigns with KATRIN.
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