New gamma-ray contributions to supersymmetric dark matter annihilation

By T. Bringmann, L. Bergstrom, J. Edsjo. 2007

277 citations recorded by the source corpus.

We compute the electromagnetic radiative corrections to all leading annihilation processes which may occur in the Galactic dark matter halo, for dark matter in the framework of supersymmetric extensions of the Standard Model (MSSM and mSUGRA), and present the results of scans over the parameter space that is consistent with present observational bounds on the dark matter density of the Universe. Although these processes have previously been considered in some special cases by various authors, our new general analysis shows novel interesting results with large corrections that may be of importance, e.g., for searches at the soon to be launched GLAST gamma-ray space telescope. In particular, it is pointed out that regions of parameter space where there is a near degeneracy between the dark matter neutralino and the tau sleptons, radiative corrections may boost the gamma-ray yield by up to three or four orders of magnitude, even for neutralino masses considerably below the TeV scale, and will enhance the very characteristic signature of dark matter annihilations, namely a sharp step at the mass of the dark matter particle. Since this is a particularly interesting region for more constrained mSUGRA models of supersymmetry, we use an extensive scan over this parameter space to verify the significance of our findings. We also re-visit the direct annihilation of neutralinos into photons and point out that, for a considerable part of the parameter space, internal bremsstrahlung is more important for indirect dark matter searches than line signals.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e0fcd979c4813d74414bdb918886a73618ef1d25

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Citations in the corpus

Constrained supersymmetry after two years of LHC data: a global view with Fittino (2012, background): “However we caution that this is not straightforward to implement in those regions of the parameter space where the photon spectra are very modeldependent [153].”
Optimized dark matter searches in deep observations of Segue 1 with MAGIC (2013, background): “Photons can also be produced in the so-called internal QED bremsstrahlung [48]: if neutralinos annihilate into leptons, the annihilation exchange particle is a charged sparticle that can emit a photon.”
Dark matter and fundamental physics with the Cherenkov Telescope Array (2012, background): “Fortunately, gamma-rays of different origin typically have different spectral shapes, with the DM-induced emission characterized by the peculiar cut-off at E 1⁄4 mv and other remarkable spectral features [113,112], in contrast to the plain spectral shapes (typically power-laws within the energy rang”
A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope (2012, background): “Additional prominent spectral features in the gamma-ray flux are generated by the emission of internal bremsstrahlung (IB) photons during DM annihilation [36–40].”
WIMP dark matter candidates and searches—current status and future prospects (2017, background): “e loop level but are nearly impossible to mimic by astrophysical background [232]. Internal bremsstrahlung can also lead to sharp spectral feature as well as lifting chiral suppression in some models [233]. In addition, -rays can also be produced as secondary products of DM annihilations into other ”
Fermi LAT Search for Internal Bremsstrahlung Signatures from Dark Matter Annihilation (2012, background): “This process was later dubbed virtual internal bremsstrahlung (VIB), which together with photons from final-state radiation (FSR) constitute the full internal bremsstrahlung (IB) spectrum [22]; the corresponding Feynman diagrams are shown in Fig.”
Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, background): “The exact form of VIB spectra, however, is rather model-dependent [58] – which in principle would allow an efficient discrimination between DM models for large enough statistics (see e.”
The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST (2008, background): “Recently Bringmann et al. (2008) presented new calculations of the gamma-ray spectrum from DM annihilation, including electromagnetic radiative corrections to all leading annihilation processes.”
In wino veritas? Indirect searches shed light on neutralino dark matter (2013, background): “We will also neglect the possibility of sharp linelike spectral features arising from internal bremsstrahlung [38,39], which require scalars tuned to be nearly degenerate in mass with the neutralino, and hence are absent in models with a split spectrum.”