Search for heavy neutrinos mixing with tau neutrinos

Details Search for heavy neutrinos mixing with tau neutrinos Search for heavy neutrinos mixing with tau neutrinos

2001-01-24

arxiv.org/abs/hep-ex/0101041v2

Phys.Lett.B506:27-38,2001

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 7 figures, a few comments added

Scientific paper

10.1016/S0370-2693(01)00362-8

We report on a search for heavy neutrinos ($\nus$) produced in the decay $D_s\to \tau \nus$ at the SPS proton target followed by the decay $\nudecay$ in the NOMAD detector. Both decays are expected to occur if $\nus$ is a component of $\nu_{\tau}$.\ From the analysis of the data collected during the 1996-1998 runs with $4.1\times10^{19}$ protons on target, a single candidate event consistent with background expectations was found. This allows to derive an upper limit on the mixing strength between the heavy neutrino and the tau neutrino in the $\nus$ mass range from 10 to 190 $\rm MeV$. Windows between the SN1987a and Big Bang Nucleosynthesis lower limits and our result are still open for future experimental searches. The results obtained are used to constrain an interpretation of the time anomaly observed in the KARMEN1 detector.\

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