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Key Laboratory of Particle Astrophysics and Experimental Physics Division and Computing Center, <a href="https://ror.org/03v8tnc06">Institute of High Energy Physics</a>, <a href="https://ror.org/034t30j35">Chinese Academy of Sciences</a>, 100049 Beijing, China.
<a href="https://ror.org/05qbk4x57">University of Chinese Academy of Sciences</a>, 100049 Beijing, China.
Phys Rev Lett. 2024 Aug 9;133(6):061001. doi: 10.1103/PhysRevLett.133.061001.
In this Letter we try to search for signals generated by ultraheavy dark matter at the Large High Altitude Air Shower Observatory (LHAASO) data. We look for possible γ rays by dark matter annihilation or decay from 16 dwarf spheroidal galaxies in the field of view of the LHAASO. Dwarf spheroidal galaxies are among the most promising targets for indirect detection of dark matter that have low fluxes of astrophysical γ-ray background while having large amount of dark matter. By analyzing more than 700 days of observational data at LHAASO, no significant dark matter signal from 1 TeV to 1 EeV is detected. Accordingly we derive the most stringent constraints on the ultraheavy dark matter annihilation cross section up to EeV. The constraints on the lifetime of dark matter in decay mode are also derived.
在这封信中，我们试图在大型高海拔宇宙线观测站（LHAASO）的数据中寻找由超重暗物质产生的信号。我们在LHAASO视场内寻找来自16个矮球状星系的暗物质湮灭或衰变产生的可能的γ射线。矮球状星系是间接探测暗物质最有希望的目标之一，它们的天体物理γ射线背景通量较低，而暗物质含量却很大。通过分析LHAASO超过700天的观测数据，未检测到从1 TeV到1 EeV的显著暗物质信号。据此，我们得出了对高达EeV的超重暗物质湮灭截面最严格的限制。同时也得出了对暗物质衰变模式下寿命的限制。
