Constraints from the CHARM experiment on heavy neutral leptons with tau mixing

@article{Boiarska2021ConstraintsFT,
  title={Constraints from the CHARM experiment on heavy neutral leptons with tau mixing},
  author={Iryna Boiarska and Alexey Boyarsky and Oleksii Mikulenko and Maksym Ovchynnikov},
  journal={Physical Review D},
  year={2021}
}
We re-analyze the results of the searches for Heavy Neutral Leptons (HNLs) by the CHARM experiment. We study HNL decay channel N → e+e−ν/μ+μ−ν and show that, in addition to the constraints on the HNL’s mixings with νe or νμ, the same data also implies limits on the HNLs that mix only with ντ and have masses in the range 380 MeV < mN . 1.6 GeV the region in the parameter space that was considered in the literature as a target for HNLs searches. 
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