Exploring new possibilities to discover a light pseudo-scalar at LHCbDiogo Buarque Franzosi, Giacomo Cacciapaglia, Xabier Cid Vidal, Gabriele Ferretti, Thomas Flacke and Carlos Vázquez SierraEur. Phys. J. C, 82 1 (2022) 3DOI: https://doi.org/10.1140/epjc/s10052-021-09930-y