Nonperturbative effect on dark matter annihilation and gamma ray signature from the galactic center

By J. Hisano, S. Matsumoto, M. Nojiri, Osamu Saito. 2004

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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 SU(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 non-perturbative effects by using the non-relativistic effective theory for the two-body states of the dark matter and its SU(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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/299a740bf4ebc6cde58bea08f79b8e6970137346

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Citations in the corpus

Hidden charged dark matter (2009, background): “First, at low velocities, its annihilation cross section is enhanced by the Sommerfeld effect [28]; in Feynman diagrammatic language, this enhancement arises from diagrams with additional U(1)EM gauge bosons exchanged in the t-channel that are higher order in gauge coupling, but kinematically enhanc”
Benchmarks for dark matter searches at the LHC (2014, background): “The annihilation of two coloured particles, in the non-relativistic limit, is strongly affected by non-perturbative Sommerfeld QCD corrections [90] (see also [91–96]), which describe initial state attraction or repulsion due the strong force.”
Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, background): “(1) contains all the particle physics input and, for the typically very small DM velocities, is usually sufficiently independent of v(r) that it can be pulled outside the integrals (note, however, that this is not true for strongly velocity-dependent cross-sections like in the case of Sommerfeld enh”
Pulsars as the sources of high energy cosmic ray positrons (2008, background): “Such a large rate could, in principle, result from the dark matter possessing an annihilation cross section in excess of the value predicted for a simple s-wave thermal relic (σv ∼ 3 × 10−26 cm3/sec), for example due to the Sommerfeld effect [6, 10, 11] or in the case that the WIMP is of non-thermal”