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25 April 2024

» arxiv » nucl-ex/0605002

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On the muon neutrino mass
N. Angelov ; F. Balestra ; Yu. Batusov ; A. Bianconi ; M.P. Bussa ; L. Busso ; L. Ferrero ; R. Garfagnini ; I. Gnesi ; E. Lodi Rizzini ; A. Maggiora ; D. Panzieri ; G. Piragino ; G. Pontecorvo ; F. Tosello ; L. Venturelli ;
Date:	3 May 2006
Abstract:	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.
Source:	arXiv, nucl-ex/0605002
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