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:1226303

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

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
European Organization for Nuclear Research (CERN), Geneva (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¯), dark matter with mass between threshold and approximately (165, 190, 280, 310) GeV gives an acceptable fit. The fit range for bb¯ is also enlarged to 35 GeV ≲ m_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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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1226303

Report Number(s):: FERMILAB-PUB-14-411-T; CERN-PH-TH-2014-219; arXiv eprint number arXiv:1411.2592

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 05; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 96 works

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