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Constraints from the CHARM experiment on Heavy Neutral Leptons with tau mixing

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arxiv 2107.14685 v3 pith:V4EMSHFE submitted 2021-07-30 hep-ph

classification hep-ph
keywords hnlscharmconstraintsexperimentheavyleptonsneutralsearches
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abstract

We re-analyze the results of the searches for Heavy Neutral Leptons (HNLs) by the CHARM experiment. We study HNL decay channel $N\to e^{+}e^{-}\nu/\mu^{+}\mu^{-}\nu$ and show that, in addition to the constraints on the HNL's mixings with $\nu_e$ or $\nu_{\mu}$, the same data also implies limits on the HNLs that mix only with $\nu_{\tau}$ and have masses in the range $380 \text{ MeV}<m_{N}\lesssim 1.6\text{ GeV}$ - the region in the parameter space that was considered in the literature as a target for HNLs searches.

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Cited by 5 Pith papers

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