P3H-19-054: τ → μμμ at a rate of one out of 10^14 tau decays?

P3H-19-054
Title: $\tau \rightarrow \mu\mu\mu$ at a rate of one out of $10^{14}$ tau decays?
Type: Paper
Authors: P. Blackstone, M. Fael, E. Passemar
arXiv: 1912.09862
Info:Published in: Eur.Phys.J.C 80 (2020) 6