This thesis is dedicated to the analysis of the first two measurement campaigns of the KATRIN experiment. In terms of effective electron antineutrino mass, an upper limit of 0.8 eV (90% C.L.) could be inferred, reaching for the first time into the sub-eV regime. Moreover, to exploit the full physics potential of the KATRIN experiment, a search for light sterile neutrinos was conducted. As no sterile-neutrino signal is observed, exclusion contours are drawn at 95% C.L. covering the parameter space of the long-persisting light-sterile neutrino anomalies to a great extent.
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This thesis is dedicated to the analysis of the first two measurement campaigns of the KATRIN experiment. In terms of effective electron antineutrino mass, an upper limit of 0.8 eV (90% C.L.) could be inferred, reaching for the first time into the sub-eV regime. Moreover, to exploit the full physics potential of the KATRIN experiment, a search for light sterile neutrinos was conducted. As no sterile-neutrino signal is observed, exclusion contours are drawn at 95% C.L. covering the parameter spac...
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