2008/02/21 by Howard Baer, A. Belyaev, Alexander Belyaev +1
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.77.095013
published as Phys.Rev.D77:095013,2008 · 17 pages with 13 eps figures
arxiv created 2008/02/21 · openalex publication_date 2008/05/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The observation of the Egret experiment of an excess of diffuse gamma rays with energies above E_\ensuremathγ=1 GeV has previously been interpreted in the context of the minimal supergravity model (mSUGRA) as coming from neutralino annihilation into mainly b-quarks in the galactic halo, with neutralino mass in the vicinity of 50--70 GeV. We observe that, in order to obtain the correct relic abundance of neutralinos in accord with WMAP measurements, the corresponding neutralino-proton direct detection (DD) rates should be in excess of recent limits from the Xenon-10 collaboration. While it does not appear possible to satisfy the Egret, WMAP, and Xenon-10 constraints simultaneously within the mSUGRA model, we find that it is easily possible in models with nonuniversal Higgs soft masses (NUHM). In either case, gluino pair production from m_\stackrel\texttildelowg\ensuremath∼400--500 GeV should occur at large rates at the CERN LHC, and a gluino pair production signal should be visible with just 0.1 fb^\ensuremath-1 of integrated luminosity. The NUHM interpretation predicts a rather light spectrum of heavy Higgs bosons with mA\ensuremath∼140--200 GeV over the whole parameter space which would interpret Egret data. Spin-independent DD rates are predicted to be just above 10^\ensuremath-8 pb, within range of the next round of direct dark matter detection experiments.