Final Results from phase II of the Mainz Neutrino Mass Search in Tritium $β$ Decay

Details Final Results from phase II of the Mainz Neutrino Mass Search in Tritium $β$ Decay Final Results from phase II of the Mainz Neutrino Mass Search in Tritium $β$ Decay

2004-12-20

arxiv.org/abs/hep-ex/0412056v2

Eur.Phys.J.C40:447-468,2005

Physics

High Energy Physics

High Energy Physics - Experiment

22 pages, 22 figures submitted to EPJ C

Scientific paper

10.1140/epjc/s2005-02139-7

The paper reports on the improved Mainz experiment on tritum $\beta$ spectroscopy which yields a 10 times' higher signal to background ratio than before. The main experimental effects and systematic uncertainties have been investigated in side experiments and possible error sources have been eliminated. Extensive data taking took place in the years 1997 to 2001. A residual analysis of the data sets yields for the square of the electron antineutrino mass the final result of $m^2(\nu_e)=(-0.6 \pm 2.2_{\rm{stat}} \pm 2.1_{\rm{syst}})$ eV$^2$/c$^4$. We derive an upper limit of $m(\nu_e)\leq 2.3$ eV/c$^2$ at 95% confidence level for the mass itself.

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