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The high-energy Diffuse Gamma-Ray Background (DGRB) is expected to beproduced by unresolved isotropically distributed astrophysical objects,potentially including dark matter annihilation or decay emissions in galacticor extragalactic structures. The DGRB has only been observed below 1 TeV; abovethis energy, upper limits have been reported. Observations or stringent limitson the DGRB above this energy could have significant multi-messengerimplications, such as constraining the origin of TeV-PeV astrophysicalneutrinos detected by IceCube. The High Altitude Water Cherenkov (HAWC)Observatory, located in central Mexico at 4100 m above sea level, is sensitiveto gamma rays from a few hundred GeV to several hundred TeV and continuouslyobserves a wide field-of-view (2 sr). With its high-energy reach and large areacoverage, HAWC is well-suited to notably improve searches for the DGRB at TeVenergies. In this work, strict cuts have been applied to the HAWC dataset tobetter isolate gamma-ray air showers from background hadronic showers. Thesensitivity to the DGRB was then verified using 535 days of Crab data and MonteCarlo simulations, leading to new limits above 10 TeV on the DGRB as well asprospective implications for multi-messenger studies.

Limits on the Diffuse Gamma-Ray Background above 10 TeV with HAWC