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Title: Flavored dark matter and the Galactic Center gamma-ray excess

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1180077
Grant/Contract Number:
SC0003930
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 90; Journal Issue: 6; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Agrawal, Prateek, Batell, Brian, Hooper, Dan, and Lin, Tongyan. Flavored dark matter and the Galactic Center gamma-ray excess. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.90.063512.
Agrawal, Prateek, Batell, Brian, Hooper, Dan, & Lin, Tongyan. Flavored dark matter and the Galactic Center gamma-ray excess. United States. doi:10.1103/PhysRevD.90.063512.
Agrawal, Prateek, Batell, Brian, Hooper, Dan, and Lin, Tongyan. Fri . "Flavored dark matter and the Galactic Center gamma-ray excess". United States. doi:10.1103/PhysRevD.90.063512.
@article{osti_1180077,
title = {Flavored dark matter and the Galactic Center gamma-ray excess},
author = {Agrawal, Prateek and Batell, Brian and Hooper, Dan and Lin, Tongyan},
abstractNote = {},
doi = {10.1103/PhysRevD.90.063512},
journal = {Physical Review D},
number = 6,
volume = 90,
place = {United States},
year = {Fri Sep 12 00:00:00 EDT 2014},
month = {Fri Sep 12 00:00:00 EDT 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.90.063512

Citation Metrics:
Cited by: 87works
Citation information provided by
Web of Science

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  • Thermal relic dark matter particles with a mass of 31-40 GeV and that dominantly annihilate to bottom quarks have been shown to provide an excellent description of the excess gamma rays observed from the center of the Milky Way. Flavored dark matter provides a well-motivated framework in which the dark matter can dominantly couple to bottom quarks in a flavor-safe manner. We propose a phenomenologically viable model of bottom flavored dark matter that can account for the spectral shape and normalization of the gamma-ray excess while naturally suppressing the elastic scattering cross sections probed by direct detection experiments. This modelmore » will be definitively tested with increased exposure at LUX and with data from the upcoming high-energy run of the Large Hadron Collider (LHC).« less
  • Motivated by the gamma-ray excess observed from the region surrounding the Galactic Center, we explore particle dark matter models that could potentially account for the spectrum and normalization of this signal. Taking a model-independent approach, we consider an exhaustive list of tree-level diagrams for dark matter annihilation, and determine which could account for the observed gamma-ray emission while simultaneously predicting a thermal relic abundance equal to the measured cosmological dark matter density. We identify a wide variety of models that can meet these criteria without conflicting with existing constraints from direct detection experiments or the Large Hadron Collider (LHC). Themore » prospects for detection in near future dark matter experiments and/or the upcoming 14 TeV LHC appear quite promising.« less
  • The gamma-ray excess observed from the Galactic Center can be interpreted as dark matter particles annihilating into Standard Model fermions with a cross section near that expected for a thermal relic. Although many particle physics models have been shown to be able to account for this signal, the fact that this particle has not yet been observed in direct detection experiments somewhat restricts the nature of its interactions. One way to suppress the dark matter's elastic scattering cross section with nuclei is to consider models in which the dark matter is part of a hidden sector. In such models, themore » dark matter can annihilate into other hidden sector particles, which then decay into Standard Model fermions through a small degree of mixing with the photon, Z, or Higgs bosons. After discussing the gamma-ray signal from hidden sector dark matter in general terms, we consider two concrete realizations: a hidden photon model in which the dark matter annihilates into a pair of vector gauge bosons that decay through kinetic mixing with the photon, and a scenario within the generalized NMSSM in which the dark matter is a singlino-like neutralino that annihilates into a pair of singlet Higgs bosons, which decay through their mixing with the Higgs bosons of the MSSM.« less
  • Stringent constraints from direct detection experiments and the Large Hadron Collider motivate us to consider models in which the dark matter does not directly couple to the Standard Model, but that instead annihilates into hidden sector particles which ultimately decay through small couplings to the Standard Model. We calculate the gamma-ray emission generated within the context of several such hidden sector models, including those in which the hidden sector couples to the Standard Model through the vector portal (kinetic mixing with Standard Model hypercharge), through the Higgs portal (mixing with the Standard Model Higgs boson), or both. In each case,more » we identify broad regions of parameter space in which the observed spectrum and intensity of the Galactic Center gamma-ray excess can easily be accommodated, while providing an acceptable thermal relic abundance and remaining consistent with all current constraints. We also point out that cosmic-ray antiproton measurements could potentially discriminate some hidden sector models from more conventional dark matter scenarios.« less