Revealing timid pseudo-scalars with taus at the LHC Giacomo Cacciapaglia, Gabriele Ferretti, Thomas Flacke and Hugo Serôdio Eur. Phys. J. C, 78 9 (2018) 724 Published online: 06 September 2018 DOI: 10.1140/epjc/s10052-018-6183-4