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Beam dumps and fixed-target experiments have been very sensitive probes ofsuch particles and other physics beyond the Standard Model (BSM) by consideringthe production of new states from the primary interaction in the beam dump. Ina proton beam dump, there are many secondary interactions taking place inelectromagnetic showers which may be additional production channels forpseudoscalar bosons or axion-like particles (ALPs). The target-lessconfiguration of the MiniBooNE experiment, which collected data from $1.86\times 10^{20}$ protons impinging directly on the steel beam dump, is anexcellent test of sensitivity to these production channels of ALPs in the MeVmass region. Using the null observation of the MiniBooNE dump mode data, we setnew constraints on ALPs coupling to electrons and photons produced through amultitude of channels and detected via both scattering and decays in theMiniBooNE detector volume. We find that the null result rules out parameterspace that was previously unconstrained by laboratory probes in the 10-100 MeVmass regime for both electron and photon couplings. Lastly, we make the casefor performing a dedicated analysis with 1.25$\times 10^{20}$ POT of datacollected by the ArgoNeuT experiment, which we show to have complementarysensitivity and set the stage for future searches.

New Constraints on ALP Electron and Photon Couplings from ArgoNeuT and the MiniBooNE Beam Dump