First LHAASO results impose tighter limits on dark matter lifetime

(ORDO NEWS) — Scientists from the LHAASO (Large High Altitude Air Shower Observatory) presented observational data for about 1.5 years, calculating new limits on the lifetime of heavy dark matter particles, which have masses from 105 to 109 gigaelectronvolts.

The gravitational model of the Milky Way shows that there is a very high density of dark matter in the center of the galaxy, and the gamma rays produced by the decay of this dark matter will be emitted from the center of the galaxy into the environment for hundreds or even thousands of light years.

However, for a long time, the observation of ultra-high energy gamma rays produced by heavy dark matter was difficult due to the presence of other background radiation.

Using data from the LHAASO KM2A subarray, the scientists measured the intensity of ultrahigh-energy gamma rays outside the galactic plane and set a limit on the lifetime of heavy dark matter.

This limit is almost 10 times higher than previous results. This study shows that the lifetime of dark matter with mass PeV is at least about a billion trillion years.

The observations of gamma rays by the LHAASO are largely complementary to other dark matter-searching experiments (such as the neutrino observation experiments).

As the full array of LHAASO runs stably and gradually accumulates data, this limit will be further increased.


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