Crossing into the $m_a>f_a$ Region for Leptophilic ALPs

Marta F. Zamoro, Álvaro Lozano-Onrubia, Álvaro Lozano-Onrubia +2

Axion-like particles (ALPs) are typically identified as pseudoscalars whose couplings are shift-symmetry invariant with the exception of their couplings to gauge bosons and their m…