publication . Preprint . Article . 2009

Direct constraints on minimal supersymmetry from Fermi-LAT observations of the dwarf galaxy Segue 1

Pat Scott; Jan Conrad; Joakim Edsjö; Lars Bergström; Christian Farnier; Yashar Akrami;
Open Access
  • Published: 17 Sep 2009 Journal: Journal of Cosmology and Astroparticle Physics, volume 2,010, pages 31-31 (eissn: 1475-7516, Copyright policy)
  • Publisher: IOP Publishing
Abstract
The dwarf galaxy Segue 1 is one of the most promising targets for the indirect detection of dark matter. Here we examine what constraints 9 months of Fermi-LAT gamma-ray observations of Segue 1 place upon the Constrained Minimal Supersymmetric Standard Model (CMSSM), with the lightest neutralino as the dark matter particle. We use nested sampling to explore the CMSSM parameter space, simultaneously fitting other relevant constraints from accelerator bounds, the relic density, electroweak precision observables, the anomalous magnetic moment of the muon and B-physics. We include spectral and spatial fits to the Fermi observations, a full treatment of the instrumental response and its related uncertainty, and detailed background models. We also perform an extrapolation to 5 years of observations, assuming no signal is observed from Segue 1 in that time. Results marginally disfavour models with low neutralino masses and high annihilation cross-sections. Virtually all of these models are however already disfavoured by existing experimental or relic density constraints.
22 pages, 5 figures; added extra scans with extreme halo parameters, expanded introduction and discussion in response to referee's comments
Subjects
arXiv: High Energy Physics::PhenomenologyAstrophysics::High Energy Astrophysical Phenomena
free text keywords: Astronomy and Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics (astro-ph.CO), High Energy Astrophysical Phenomena (astro-ph.HE), High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, Astrophysics, Fermi Gamma-ray Space Telescope, Minimal Supersymmetric Standard Model, Galaxy, Physics, Dark matter, Neutralino, Dwarf galaxy, Segue, Supersymmetry
1 research outcomes, page 1 of 1
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