Article published at Nucl.Phys.B: Leptonic meson decays into invisible ALP

Our article Leptonic meson decays into invisible ALP, in collaboration with Alfredo Guerrera (U. Padova), Siannah Peñaranda (U. Zaragoza) and Stefano Rigolin (U. Padova) has been published at Nuclear Physics B 979 (2022) 115791.