Dark matter annihilation into four-body final states and implications for the AMS antiproton excess

Journal Article · Tue Jan 09 00:00:00 EST 2018 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.97.023003· OSTI ID:1541151

Clark, Steven J. ^[1]; Dutta, Bhaskar ^[1]; Strigari, Louis E. ^[1]

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1. Texas A & M University, College Station, TX (United States)

Here we consider dark matter annihilation into a general set of final states of standard model particles, including two-body and four-body final states that result from the decay of intermediate states. For dark matter masses ~10 – 10⁵ GeV, we use updated data from Planck and from high gamma-ray experiments such as Fermi-LAT, MAGIC, and VERITAS to constrain the annihilation cross section for each final state. The Planck constraints are the most stringent over the entire mass range for annihilation into light leptons, and the Fermi-LAT constraints are the most stringent for four-body final states up to masses ~10⁴ GeV. We consider these constraints in light of the recent AMS antiproton results, and show that for light mediators it is possible to explain the AMS data with dark matter, and remain consistent with Fermi-LAT Inner Galaxy measurements, for m_χ~ 60 – 100 GeV mass dark matter and mediator masses m_φ/m_χ ≲ 1.

• Research Organization: Texas A & M Univ., College Station, TX (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
• Grant/Contract Number: SC0010813; PHY-1522717; NNX12AC71G; de-sc0010813
• OSTI ID: 1541151
• Alternate ID(s): OSTI ID: 1416219
• Report Number(s): MI-TH-1764
• Journal Information: Physical Review. D., Vol. 97, Issue 2; ISSN 2470-0010
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
cosmic microwave background
dark matter