Probing QCD Axions or Axion-like Particles in three-body $K$ Decays

Mael Cavan-Piton, Diego Guadagnoli, Axel Iohner +2

Two-body decays like $K\to \pi a$ rank among the most constraining collider probes for new, low-mass, feebly interacting pseudoscalar particles $a$. We explore an alternative class o…