Exploring new possibilities to discover a light pseudo-scalar at LHCb Diogo Buarque Franzosi, Giacomo Cacciapaglia, Xabier Cid Vidal, Gabriele Ferretti, Thomas Flacke and Carlos Vázquez Sierra Eur. Phys. J. C, 82 1 (2022) 3 Published online: 03 January 2022 DOI: 10.1140/epjc/s10052-021-09930-y