Electroweak ALP searches at a muon collider

A bstract high-energy muon collider with center-of-mass energy around and above 10 TeV is also a vector boson fusion (VBF) machine, due to the significant virtual electroweak (EW) gauge content of beams. This feature, together clean environment, makes it an ideal search for TeV-scale axion-like particles (ALP) coupling Standard Model EW bosons, which current other future colliders have limited sensitivities to. We present detailed analyses heavy ALP searches in both VBF associated production channels at different running benchmarks. show projected constraints on couplings effective field theory, including operator its coefficient not determined by mixed Peccei-Quinn anomaly. demonstrate that could probe new parameter space push between bosons one order magnitude compared HL-LHC. The limits strategies ALPs be applied types resonances bosons.