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Interpreting the Fermi-LAT gamma ray excess in the simplified framework
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. University of Utah, United States.
2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 92, no 12, 123520Article in journal (Refereed) PublishedText
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 92, no 12, 123520
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-180492DOI: 10.1103/PhysRevD.92.123520ISI: 000366505800002ScopusID: 2-s2.0-84952332420OAI: diva2:894503

QC 20160115

Available from: 2016-01-15 Created: 2016-01-14 Last updated: 2016-01-15Bibliographically approved

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Savage, Chris
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