Probing sterile neutrinos in B (D) meson decays at Belle II (BESIII)C. S. Kim, Youngjoon Kwon, Donghun Lee, Sechul Oh and Dibyakrupa SahooEur. Phys. J. C, 80 8 (2020) 730DOI: https://doi.org/10.1140/epjc/s10052-020-8310-2