Speaker
Description
One of the most pressing questions for modern physics is the nature of dark matter (DM). Several efforts have been made to model this elusive kind of matter since the largest fraction of DM cannot consist of any of the known particles of the Standard Model (SM) according to the Lambda-CDM model. Among the candidates proposed to explain the nature of DM, weakly interacting massive particles (WIMPs) are one of the preferred ones. WIMPs could be detected indirectly by observing the secondary products of their annihilation into SM particles. Extensive observing campaigns with gamma-ray telescopes and neutrino detectors have been carried out over the past decades in presumed DM-dominated regions such as dwarf spheroidal galaxies (dSphs). In the absence of a signal, constraining limits on the DM self-annihilation cross-section have been set. In this contribution, we present a joint likelihood analysis combining dSph observations taken with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS to maximize the sensitivity of indirect DM searches. The observed limits on the thermally-average velocity-weighted annihilation cross-section of our combined analysis reach $\sim 3 \times 10^{-25}$ cm$^3$s$^{-1}$ in the $\tau^+\tau^-$ annihilation channel for a 2 TeV DM particle mass.