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- W2092803088 abstract "Detection of gamma rays from dark matter annihilation in the galactic center is one of the feasible techniques to search for dark matter. We evaluate the gamma-ray flux in the case that the dark matter has an electroweak $mathrm{S}mathrm{U}(2{)}_{L}$ charge. Such dark matter is realized in the minimal supersymmetric standard model (MSSM) when the lightest SUSY particle is the Higgsino- or Wino-like neutralino. When the dark matter is heavy compared to the weak gauge bosons, the leading-order calculation of the annihilation cross sections in perturbation breaks down due to a threshold singularity. We take into account nonperturbative effects by using the nonrelativistic effective theory for the two-body states of the dark matter and its $mathrm{S}mathrm{U}(2{)}_{L}$ partner(s), and evaluate precise cross sections relevant to the gamma-ray fluxes. We find that the annihilation cross sections may be enhanced by several orders of magnitude due to resonances when the dark matter mass is larger than 1 TeV. Furthermore, the annihilation cross sections in the MSSM may be changed by factors even when the mass is about 500 GeV. We also discuss sensitivities to gamma-ray signals from the galactic center in the GLAST satellite detector and the large Air Cerenkov Telescope arrays." @default.
- W2092803088 created "2016-06-24" @default.
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- W2092803088 date "2005-03-28" @default.
- W2092803088 modified "2023-10-01" @default.
- W2092803088 title "Nonperturbative effect on dark matter annihilation and gamma ray signature from the galactic center" @default.
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- W2092803088 doi "https://doi.org/10.1103/physrevd.71.063528" @default.
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