Flavour changing neutral currents and axions

In this work we analyze the signals of axion-like particles (ALPs) in flavour changing neutral currents processes. We adopt an effective field theory approach to parametrize ALP couplings to the electroweak bosonic sector and ALP contribution to FCNC decays is computed at one-loop order. We put constraints on ALP couplings to W boson and fermions stemming from the experimental bounds given by meson decays, assuming a flavour blind ALP-fermion interaction. We perform our analysis in the hypothesis of invisible ALP and we study the interplay between the different couplings, which produces an interesting pattern of destructive/constructive interference.