Lepton polarization asymmetries in rare semi-tauonic exclusive decays at FCC-eeJ. F. Kamenik, S. Monteil, A. Semkiv and L. Vale SilvaEur. Phys. J. C, 77 10 (2017) 701DOI: https://doi.org/10.1140/epjc/s10052-017-5272-0