Implications for constrained supersymmetry of combined H.E.S.S. observations of dwarf galaxies, the Galactic halo and the Galactic Centre
- Oskar Klein Centre for Cosmoparticle Physics and Department of Physics, Stockholm University, AlbaNova University Centre, SE-10691 Stockholm (Sweden)
- Department of Physics, McGill University, 3600 rue University, Montréal, QC, H3A 2T8 (Canada)
In order to place limits on dark matter (DM) properties using γ-ray observations, previous analyses have often assumed a very simple parametrisation of the γ-ray annihilation yield; typically, it has been assumed that annihilation proceeds through a single channel only. In realistic DM models, annihilation may occur into many different final states, making this quite a rough ansatz. With additional processes like virtual internal bremsstrahlung and final state radiation, this ansatz becomes even more incorrect, and the need for scans of explicit model parameter spaces becomes clear. Here we present scans of the parameter space of the Constrained Minimal Supersymmetric Standard Model (CMSSM), considering γ-ray spectra from three dwarf galaxies, the Galactic Centre region and the broader Galactic halo, as obtained with the High-Energy Stereoscopic System (H.E.S.S.). We present a series of likelihood scans combining the H.E.S.S. data with other experimental results. We show that including combined observations of the Sagittarius, Carina and Sculptor dwarf galaxies strongly disfavour the coannihilation region of the CMSSM and models with large annihilation cross-sections. Without the Sagittarius dwarf, which admittedly has a rather uncertain dark matter profile, the results are similar, but weaker. The Galactic Centre search is complicated by a strong (unknown) γ-ray source, and we see no significant effect on the CMSSM parameter space when assuming a realistic Galactic Centre DM density profile.
- OSTI ID:
- 22279695
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2011, Issue 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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