Search for heavy neutral leptons in $\ddot{I}{€}^{+}$ decays to positrons

NA62 Collaboration

A search for heavy neutral lepton ($N$) production in $\ddot{I}{€}^{+}\to e^{+}N$ in-flight decays using data collected by the NA62 experiment at CERN in 2017-2024 is reported. Upper limits fo…