Revisiting the limits on dark matter annihilation cross-section and decay lifetime in light of electron and positron fluxes

We revisit the upper bound on the annihilation cross-section, σv of a stable dark matter (DM) of mass 500-10 14 GeV by considering five different channels: W+W-, b, μ+μ-, τ+τ-, and e+e-. We use the observed electron and positron fluxes from CALET, DAMPE, HESS, positron flux from AMS-02, and gamma-ray flux from HAWC, GRAPES-3, CASA-MIA to constrain the annihilation cross-section. We also consider unstable DM of mass 10 3-10 16 GeV decaying to W+W-, b, μ+μ-, τ+τ-, and e+e- and derive the corresponding lower bound on the DM lifetime, τ DM. We find that the latest AMS-02 data provide the most stringent constraints on σv for DM masses below 2 TeV, while HESS yields the strongest limits for M DM 2 TeV. The HESS gives a much more stringent limit on the DM lifetime, excluding τ DM toμ+μ- O(10 30) s for a 10 TeV mass of DM. The limits on σv derived from the e+e- flux are competitive with those from γ-ray and neutrino observations for DM masses in the range 10 5 -- 10 11 GeV, and become the most stringent beyond this range. For decaying DM, the e+e- flux provides the strongest constraints on the DM lifetime over the mass range 10 cubed -- 10 9 GeV.