1993/02/23 by A. D. Dolgov, Ira Z. Rothstein, I. Z. Rothstein · 6 citations
Physics and Astronomy · #Neutrino Physics Research #Noncommutative and Quantum Gravity Theories #Particle physics theoretical and experimental studies #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevlett.71.476
published as Phys.Rev.Lett.71:476-479,1993 · 9 pages (2 figures available upon request), UM-AC-93-02
arxiv created 1993/02/23 · openalex publication_date 1993/07/26 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper we reconsider recently derived bounds on MeV tau neutrinos, taking into account previously unaccounted for effects. We find that, assuming that the neutrino lifetime is longer than \ensuremath∼100 sec, the constraint Neff3.6 rules out \ensuremathν_\mathrm\ensuremathτ masses in the range 0.5m_\ensuremathν\mathrm\ensuremathτ35 MeV for Majorana and 0.3m_\ensuremathν\mathrm\ensuremathτ35 MeV for Dirac neutrinos. Given that the present laboratory upper bound is 31 MeV, our results imply an upper bound of 0.5 MeV for Majorana neutrinos and of 0.3 MeV for Dirac neutrinos.