TY - JOUR
T1 - Interpreting the Fermi-LAT gamma ray excess in the simplified framework
AU - Balazs, Csaba
AU - Li, Tong
AU - Savage, Chris
AU - White, Martin
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
UR - http://journals.aps.org.ezproxy.lib.monash.edu.au/prd/pdf/10.1103/PhysRevD.92.123520
U2 - 10.1103/PhysRevD.92.123520
DO - 10.1103/PhysRevD.92.123520
M3 - Article
VL - 92
SP - 1
EP - 15
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 12
M1 - 123520
ER -