Testing axion couplings to leptons in $Z$ decays at future $e^{+}{e}^{-}$ colliders

Lorenzo Calibbi, Zijie Huang, Shaoyang Qin +2

We study the possibility of probing the existence of a light, invisible, axion-like particle (ALP) $a$ in leptonic decays of the $Z$ boson at the proposed high-energy $e^{+}{e}^{-}$ coll…