On the muon neutrino mass

Details On the muon neutrino mass On the muon neutrino mass

2006-05-03

arxiv.org/abs/nucl-ex/0605002v1

Nucl.Phys.A780:78-89,2006

Physics

Nuclear Physics

Nuclear Experiment

18 pages, 5 eps figures

Scientific paper

10.1016/j.nuclphysa.2006.09.011

During the runs of the PS 179 experiment at LEAR of CERN, we photographed an event of antiproton-Ne absorption, with a complete pi+ -> mu+ ->e+ chain. From the vertex of the reaction a very slow energy pi+ was emitted. The pi+ decays into a mu+ and subsequently the mu+ decays into a positron. At the first decay vertex a muon neutrino was emitted and at the second decay vertex an electron neutrino and a muon antineutrino. Measuring the pion and muon tracks and applying the momentum and energy conservation and using a classical statistical interval estimator, we obtained an experimental upper limit for the muon neutrino mass: m_nu < 2.2 MeV at a 90% confidence level. A statistical analysis has been performed of the factors contributing to the square value of the neutrino mass limit.

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