Abstract
The most precise upper limits for the muon-neutrino mass\(m_{v_\mu }\) have been obtained by measuring the muon momentump μ + in pion decayπ +→μ+ v μ at rest. The current result for the squared neutrino mass,\(m_{v_\mu } ^2 = - 0.154 \pm 0.045MeV^2\), negative by 3.4 standard deviations, indicates that the experimental value for at least one of the three quantities used in the\(\left( {m_{v_\mu } ^2 } \right) -\) derivation (p μ +,m π+,m μ+) is wrong.
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Daum, M., Frosch, R., Herter, D. et al. Measurements of the muon-neutrino mass. Z. Phys. C - Particles and Fields 56 (Suppl 1), S114–S116 (1992). https://doi.org/10.1007/BF02426784
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DOI: https://doi.org/10.1007/BF02426784