Supersymmetric interpretation of the Egret GeV anomaly, Xenon-10 dark matter search limits, and the CERN LHC

Baer, Howard, Belyaev, Alexander and Summy, Heaya (2008) Supersymmetric interpretation of the Egret GeV anomaly, Xenon-10 dark matter search limits, and the CERN LHC. Physical Review D, 77 (9), 095013-[11pp]. (doi:10.1103/PhysRevD.77.095013).

Abstract

The observation of the Egret experiment of an excess of diffuse gamma rays with energies above Egamma=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 mg-tilde~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-1 of integrated luminosity. The NUHM interpretation predicts a rather light spectrum of heavy Higgs bosons with mA~140–200 GeV over the whole parameter space which would interpret Egret data. Spin-independent DD rates are predicted to be just above 10-8 pb, within range of the next round of direct dark matter detection experiments.

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Contributors

Author: Alexander Belyaev

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