Implications of a 130 GeV Gamma-Ray Line for Dark Matter
Recent reports of a gamma-ray line feature at -130 GeV in data from the Fermi Gamma-Ray Space Telescope have generated a great deal of interest in models in which dark matter particles annihilate with a sizable cross section to final states including photons. In this paper, we take a model-independent approach and discuss a number of possibilities for dark matter candidates which could potentially generate such a feature. While we identify several scenarios which could lead to such a gamma-ray line, these models are each fairly constrained. In particular, viable models require large couplings (g{>=}1-3) and additional charged particles with masses in the range of approximately -130-200 GeV. Furthermore, lower energy gamma-ray constraints from the Galactic center force us to consider scenarios in which the dark matter annihilates in the early Universe through velocity-suppressed processes or to final states which yield relatively few gamma-rays (such as e{sup +}e{sup -}, {mu}{sup +}{mu}{sup -}, or v{bar v}). An exception to these conclusions can be found in models in which the dark matter annihilates to heavy intermediate states which decay to photons to generate a linelike gamma-ray spectrum.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1049401
- Report Number(s):
- FERMILAB-PUB-12-259-A; arXiv eprint number arXiv:1205.6811; TRN: US1204824
- Journal Information:
- Physical Review. D, Condensed Matter and Materials Physics, Vol. 86; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
CHARGED PARTICLES
COUPLINGS
CROSS SECTIONS
DATA
DECAY
GAMMA ASTRONOMY
INTERMEDIATE STATE
GEV RANGE
NONLUMINOUS MATTER
PARTICLES
PHOTONS
SPACE
TELESCOPES
UNIVERSE
Astrophysics
Phenomenology-HEP