WIMPs at the galactic center

Agrawal, Prateek; Batell, Brian; Fox, Patrick J.; Harnik, Roni

doi:10.1088/1475-7516/2015/05/011

Title: WIMPs at the galactic center

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/05/011· OSTI ID:22454546

Agrawal, Prateek ^[1]; Batell, Brian ^[2]; Fox, Patrick J.; Harnik, Roni ^[1]

Theoretical Physics Department, Fermilab,Batavia, Illinois 60510 (United States)
CERN, Theory Division,CH-1211 Geneva 23 (Switzerland)

Simple models of weakly interacting massive particles (WIMPs) predict dark matter annihilations into pairs of electroweak gauge bosons, Higgses or tops, which through their subsequent cascade decays produce a spectrum of gamma rays. Intriguingly, an excess in gamma rays coming from near the Galactic center has been consistently observed in Fermi data. A recent analysis by the Fermi collaboration confirms these earlier results. Taking into account the systematic uncertainties in the modelling of the gamma ray backgrounds, we show for the first time that this excess can be well fit by these final states. In particular, for annihilations to (WW, ZZ, hh, tt{sup -bar}), dark matter with mass between threshold and approximately (165, 190, 280, 310) GeV gives an acceptable fit. The fit range for bb{sup -bar} is also enlarged to 35 GeV≲m{sub χ}≲165 GeV. These are to be compared to previous fits that concluded only much lighter dark matter annihilating into b, τ, and light quark final states could describe the excess. We demonstrate that simple, well-motivated models of WIMP dark matter including a thermal-relic neutralino of the MSSM, Higgs portal models, as well as other simplified models can explain the excess.

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Sponsoring Organization:: SCOAP3, CERN, Geneva (Switzerland)

OSTI ID:: 22454546

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 05; Other Information: PUBLISHER-ID: JCAP05(2015)011; OAI: oai:repo.scoap3.org:10216; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516

Country of Publication:: United States

Language:: English

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