Search for dark matter using sub-PeV $\boldsymbol{\gamma}$-rays observed by Tibet AS$_{\boldsymbol{\gamma}}$

Understand

The discovery of diffuse sub-PeV gamma-rays by the Tibet AS$_\gamma$ Collaboration promises to revolutionize our understanding of the high-energy astrophysical universe.

• It has been shown that these data broadly agree with prior theoretical expectations.
• We study the impact of this discovery on a well-motivated new physics scenario: PeV-scale decaying dark matter (DM).
• Considering a wide range of final states in DM decay, a number of DM density profiles, and numerous astrophysical background models, we find that these data provide the most stringent limit on DM lifetime for various Standard Model final states.