Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_γ$ and LHAASO-KM2A
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| Format: | Preprint |
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2025
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| _version_ | 1866908539272822784 |
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| author | Dubey, Abhishek Saha, Akash Kumar |
| author_facet | Dubey, Abhishek Saha, Akash Kumar |
| contents | Recent measurements of diffuse sub-PeV gamma-rays by the Tibet AS$_γ$ and LHAASO collaborations have reshaped our understanding of the gamma-ray sky. Besides uncovering the nature of `PeVatrons', these measurements can also be used to probe the non-gravitational nature of dark matter. PeV-scale decaying dark matter can produce high-energy gamma rays in the final state and contribute to the measurements made by extensive air-shower detectors like Tibet AS$_γ$ and LHAASO. Using the latest Tibet AS$_γ$ upper limits on diffuse gamma rays away from the Galactic plane and the LHAASO-KM2A measurements of diffuse gamma rays from the Galactic plane, we put stringent constraints on lifetimes of decaying DM for masses $\sim 10^6 - 10^9$ GeV. Future observations of high-energy diffuse gamma-ray emission can thus provide stronger limits or potentially discover heavy decaying dark matter. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_08039 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_γ$ and LHAASO-KM2A Dubey, Abhishek Saha, Akash Kumar High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Recent measurements of diffuse sub-PeV gamma-rays by the Tibet AS$_γ$ and LHAASO collaborations have reshaped our understanding of the gamma-ray sky. Besides uncovering the nature of `PeVatrons', these measurements can also be used to probe the non-gravitational nature of dark matter. PeV-scale decaying dark matter can produce high-energy gamma rays in the final state and contribute to the measurements made by extensive air-shower detectors like Tibet AS$_γ$ and LHAASO. Using the latest Tibet AS$_γ$ upper limits on diffuse gamma rays away from the Galactic plane and the LHAASO-KM2A measurements of diffuse gamma rays from the Galactic plane, we put stringent constraints on lifetimes of decaying DM for masses $\sim 10^6 - 10^9$ GeV. Future observations of high-energy diffuse gamma-ray emission can thus provide stronger limits or potentially discover heavy decaying dark matter. |
| title | Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_γ$ and LHAASO-KM2A |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.08039 |