2014/12/31 by Karim Ghorbani, Ghorbani, Karim, Hossein Ghorbani +1 · 3 citations
Physics and Astronomy · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #astro-ph.CO #hep-ph
paper · pdf · doi:10.48550/arxiv.1501.00206
22 pages, 11 figures, phenomenology discussion extended and improved, a formula added in the Appendix, version to appear in PRD
arxiv created 2016/02/20 · arxiv updated 2016/02/23
We consider a simple renormalizable dark matter model consisting of two real scalars with a mass splitting δ, interacting with the SM particles through the Higgs portal. We find a viable parameter space respecting all the bounds imposed by invisible Higgs decay experiments at the LHC, the direct detection experiments by XENON100 and LUX and the dark matter relic abundance provided by WMAP and Planck. Despite the singlet scalar dark matter model that is fragile against the future direct detection experiments, the scalar split model introduced here survives such forthcoming bounds. We emphasize on the role of the co-annihilation processes and the mixing effects in this feature. For mDM ∼ 63 GeV in this model we can explain as well the observed gamma-ray excess in the analyses of the Fermi-LAT data at Galactic latitudes 2∘ ≤ |b| ≤ 20∘ and Galactic longitudes |l| < 20∘.