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Type: Journal article
Title: Interpreting the Fermi-LAT gamma ray excess in the simplified framework
Author: Balázs, C.
Li, T.
Savage, C.
White, M.
Citation: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 92(12):123520-1-123520-15
Publisher: American Physival Society
Issue Date: 2015
ISSN: 1550-7998
Statement of
Csaba Balázs, Tong Li, Chris Savage, and Martin White
Abstract: We test the plausibility of the hypothesis that the annihilation of a Majorana fermion dark matter particle via a scalar mediator explains the gamma ray excess from the Galactic center. Assuming that the mediator couples to all third generation fermions we calculate observables for dark matter abundance and scattering on nuclei, gamma, positron, and antiproton cosmic ray fluxes, radio emission from dark matter annihilation, and the effect of dark matter annihilations on the CMB. After discarding the controversial radio observation, we show that the dark matter model simultaneously fits the observed excesses in the cosmic gamma ray, the positron, and antiproton fluxes, while evading constraints from the CMB and direct detection. The experimental data are consistent with a dark matter (mediator) mass in the 10–100 (3–1000) GeV region and with weakly correlated couplings to bottom quarks and tau leptons with values of 10−3−1 at the 68% credibility level.
Rights: © 2015 American Physical Society
RMID: 0030041579
DOI: 10.1103/PhysRevD.92.123520
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Appears in Collections:Chemistry and Physics publications

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