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Search for heavy neutrinos mixing with tau neutrinos

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arxiv hep-ex/0101041 v2 pith:EKC42JBP submitted 2001-01-24 hep-ex

classification hep-ex
keywords heavyneutrinosdecaydetectormixingneutrinosearchtarget
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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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Forward citations

Cited by 5 Pith papers

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