WIMPs at the galactic center
Abstract
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 ≲ mχ ≲ 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.
- Authors:
-
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- European Organization for Nuclear Research (CERN), Geneva (Switzerland)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1226303
- Report Number(s):
- FERMILAB-PUB-14-411-T; CERN-PH-TH-2014-219
Journal ID: ISSN 1475-7516; arXiv eprint number arXiv:1411.2592
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2015; Journal Issue: 05; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; dark matter theory; particle physics - cosmology connection; gamma ray experiments
Citation Formats
Agrawal, Prateek, Batell, Brian, Fox, Patrick J., and Harnik, Roni. WIMPs at the galactic center. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/05/011.
Agrawal, Prateek, Batell, Brian, Fox, Patrick J., & Harnik, Roni. WIMPs at the galactic center. United States. https://doi.org/10.1088/1475-7516/2015/05/011
Agrawal, Prateek, Batell, Brian, Fox, Patrick J., and Harnik, Roni. Thu .
"WIMPs at the galactic center". United States. https://doi.org/10.1088/1475-7516/2015/05/011. https://www.osti.gov/servlets/purl/1226303.
@article{osti_1226303,
title = {WIMPs at the galactic center},
author = {Agrawal, Prateek and Batell, Brian and Fox, Patrick J. and Harnik, Roni},
abstractNote = {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 ≲ mχ ≲ 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.},
doi = {10.1088/1475-7516/2015/05/011},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 05,
volume = 2015,
place = {United States},
year = {Thu May 07 00:00:00 EDT 2015},
month = {Thu May 07 00:00:00 EDT 2015}
}
Web of Science
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Gamma-ray excess and the minimal dark matter model
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Sneutrino Dark Matter in the BLSSM
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Secondary antiprotons as a Galactic Dark Matter probe
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A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model
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Return of the WIMP: Missing energy signals and the Galactic Center excess
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Impact of Cosmic-Ray Physics on Dark Matter Indirect Searches
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The inert doublet model in the light of Fermi-LAT gamma-ray data: a global fit analysis
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The inert doublet model in the light of Fermi-LAT gamma-ray data: a global fit analysis
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Status of dark matter in the universe
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A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model
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Gamma-ray excess and the minimal dark matter model
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Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets
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Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets
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Signals of a Light Dark Force in the Galactic Center
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Secondary antiprotons as a Galactic Dark Matter probe
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The Galactic Center GeV Excess from a Series of Leptonic Cosmic-Ray Outbursts
text, January 2015
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Possible explanation of indirect gamma ray signatures from hidden sector fermionic dark matter
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Interpreting the galactic center gamma-ray excess in the NMSSM
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Gamma-Ray Excess and the Minimal Dark Matter Model
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Interpretation of the gamma-ray excess and AMS-02 antiprotons: Velocity dependent dark matter annihilations
text, January 2017
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Indirect Detection of Neutrino Portal Dark Matter
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WIMP dark matter candidates and searches - current status and future prospects
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Model-independent analysis of the DAMPE excess
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Sneutrino Dark Matter in the BLSSM
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A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter
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The Return of the WIMP: Missing Energy Signals and the Galactic Center Excess
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Pseudoscalar portal dark matter and new signatures of vector-like fermions
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Reconstructing WIMP properties through an interplay of signal measurements in direct detection, Fermi-LAT, and CTA searches for dark matter
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The inert doublet model in the light of Fermi-LAT gamma-ray data: a global fit analysis
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Explaining the Fermi Galactic Centre Excess in the CMSSM
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