A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter
Abstract
An excess of $~ 10–20 GeV$ cosmic-ray antiprotons has been identified in the spectrum reported by the AMS-02 Collaboration. The systematic uncertainties associated with this signal, however, have made it difficult to interpret these results. In this paper, we revisit the uncertainties associated with the time, charge and energy-dependent effects of solar modulation, the antiproton production cross section, and interstellar cosmic-ray propagation. After accounting for these uncertainties, we confirm the presence of a $4.7σ$ antiproton excess, consistent with that arising from a $$m_χ ≈ 64–88 GeV$$ dark matter particle annihilating to $$\bar{bb}$$ with a cross section of $$σv ≃ (0.8–5.2) × 10^{-26} m^3/s$$. If we allow for the stochastic acceleration of secondary antiprotons in supernova remnants, the data continue to favor a similar range of dark matter models $$(m_χ ≈ 46–94 GeV, σv ≈ (0.7–3.8) × 10^{-26} cm^3/s)$$ with a significance of $3.3σ$. The same range of dark matter models that are favored to explain the antiproton excess can also accommodate the excess of GeV-scale gamma rays observed from the Galactic center.
- Authors:
-
[1];
[2];
[3]
- Oakland Univ., Rochester, MI (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1529338
- Alternate Identifier(s):
- OSTI ID: 1523690
- Report Number(s):
- arXiv:1903.02549; FERMILAB-PUB-19-091-A
Journal ID: ISSN 2470-0010; PRVDAQ; 1723895
- Grant/Contract Number:
- AC02-07CH11359; FG02-13ER41958; SC0009924
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 10; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Cholis, Ilias, Linden, Tim, and Hooper, Dan. A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.99.103026.
Cholis, Ilias, Linden, Tim, & Hooper, Dan. A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter. United States. doi:10.1103/PhysRevD.99.103026.
Cholis, Ilias, Linden, Tim, and Hooper, Dan. Fri .
"A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter". United States. doi:10.1103/PhysRevD.99.103026. https://www.osti.gov/servlets/purl/1529338.
@article{osti_1529338,
title = {A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter},
author = {Cholis, Ilias and Linden, Tim and Hooper, Dan},
abstractNote = {An excess of $~ 10–20 GeV$ cosmic-ray antiprotons has been identified in the spectrum reported by the AMS-02 Collaboration. The systematic uncertainties associated with this signal, however, have made it difficult to interpret these results. In this paper, we revisit the uncertainties associated with the time, charge and energy-dependent effects of solar modulation, the antiproton production cross section, and interstellar cosmic-ray propagation. After accounting for these uncertainties, we confirm the presence of a $4.7σ$ antiproton excess, consistent with that arising from a $m_χ ≈ 64–88 GeV$ dark matter particle annihilating to $\bar{bb}$ with a cross section of $σv ≃ (0.8–5.2) × 10^{-26} m^3/s$. If we allow for the stochastic acceleration of secondary antiprotons in supernova remnants, the data continue to favor a similar range of dark matter models $(m_χ ≈ 46–94 GeV, σv ≈ (0.7–3.8) × 10^{-26} cm^3/s)$ with a significance of $3.3σ$. The same range of dark matter models that are favored to explain the antiproton excess can also accommodate the excess of GeV-scale gamma rays observed from the Galactic center.},
doi = {10.1103/PhysRevD.99.103026},
journal = {Physical Review D},
number = 10,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}
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