Blast from the past: constraints from the CHARM experiment on Heavy Neutral Leptons with tau mixing

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}

Keywords:

• Mixing (physics)
• Physics
• Particle physics
• charm
• Lepton
• Parameter space

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