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Axion-like particles (ALPs) are a broad class of pseudo-scalar bosons thatgenerically arise from broken symmetries in extensions of the standard model.In many scenarios, ALPs can mix with photons in regions with high magneticfields. Photons from distant sources can mix with ALPs, which then travelunattenuated through the Universe, before they mix back to photons in the MilkyWay galactic magnetic field. Thus, photons can traverse regions where theirsignals would normally be blocked or attenuated. In this paper, we study TeV$\gamma$-ray observations from distant blazars, utilizing the significant$\gamma$-ray attenuation expected from such signals to look for excess photonfluxes that may be due to ALP-photon mixing. We find no such excesses among astacked population of seven blazars and constrain the ALP-photon couplingconstant to fall below $\sim$3$\times$10$^{-11}$ GeV$^{-1}$ for ALP massesbelow 300 neV. These results are competitive with, or better than, leadingterrestrial and astrophysical constraints in this mass range.

Constraining Axion-Like Particles with HAWC Observations of TeV Blazars