Flavor probes of axion-like particles

Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions the Standard Model (SM). We investigate phenomenology an ALP with flavor-changing couplings, present a comprehensive analysis quark lepton observables within general effective field theory. Observables studied include rare meson decays, flavor oscillations neutral mesons, dipole moments. derive bounds on couplings as function its mass, consistently taking into account lifetime branching ratios. further calculate effects that unavoidably induced by running matching between new physics scale measurements. This allows us to benchmark models in which only single (flavorless or flavor-universal) coupling SM is at scale, this context we highlight complementarity competitiveness constraints derived from collider, beam dump astrophysical find searches for ALPs produced decays provide some strongest MeV-GeV mass range, even most flavorless models. Likewise, discuss interplay flavor-conserving flavor-violating leptons, finding generally depend strongly both. Additionally, analyze whether can explanation various experimental anomalies including those observed B-meson measurements ATOMKI KTeV experiments, anomalous magnetic moments muon electron.