PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Beyond the Standard Model
Search for Heavy Neutral Leptons in $tau$-lepton decays with the $BABAR$ detector.
S. Middleton
Full text: pdf
Pre-published on: August 21, 2022
Published on: June 15, 2023
A model independent search for a Heavy Neutral Lepton (HNL), capable of mixing with the $\tau$ neutrino, is presented. A total of 424 $fb^{-1}$ of ~\babar~ data is analyzed. No significant signal is seen. Upper limits at the 95 $\%$ confidence level are set on the extended Pontecorvo–Maki–Nakagawa–Sakata (PMNS) matrix element, $|U_{\tau 4}|^{2}$, which depend on the HNL mass hypothesis and vary from $2.31 \times 10^{-2}$ to $5.04 \times 10^{-6}$, across the mass range $100 < m_{4} < 1300 ~\text{MeV}/c^{2}$. More stringent limits being placed at higher masses.
DOI: https://doi.org/10.22323/1.414.0159
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