Constraints on decaying dark matter with LHAASO-KM2A

Discussion timeslot (ZOOM-Meeting): 21. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/91999581729
ZOOM-Meeting ID: 91999581729
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/41-Indirect-Dark-Matter-Detection-Through-Photons-and-Neutrinos-DM/95
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-05/6

Abstract:
'The measurement of diffuse gamma-ray emission could provide new insights into the propagation and acceleration of Galactic cosmic rays, the origin of neutrinos observed by IceCube, and the nature of dark matter. KM2A array in LHAASO is devoted to the detection of extensive air showers for gamma-ray astrophysics. Thanks to its large effective area and the good gamma/hadron separation, KM2A hasxa0an excellentxa0sensitivity to the diffuse gamma-ray emission abovexa0tens TeV energies.xa0 In this work, we use the data from half-KM2A to set diffuse gamma-ray flux upper limit at 90% confidence level for almost 2/3 of the sky. And we present the first constraints placed by this result to decaying dark matter particles, scrutinizing different final states and dark matter masses, from $10^5$xa0to $10^9$xa0GeV. These limits are mainly driven by galactic prompt and secondary gamma-rays emission, while the extragalactic dark matter contribution is typically subdominant due to gamma-ray absorption. Moreover, we show that in some cases LHAASO-KM2A is already probing an unexplored parameter space, and we discuss in a multi-messenger context the implications for dark matter signals in neutrino telescopes.arameter space, and we discuss in a multi-messenger context the implications for dark matter signals in neutrino telescopes.'

Authors: Marco Chianese | Zhe Li | Kenny C.Y. Ng | Gennaro Miele | Damiano Francesco Giuseppe Fiorillo
Collaboration: Lhaaso

Indico-ID: 894
Proceeding URL: https://pos.sissa.it/395/533