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Title: 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:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Oakland Univ., Rochester, MI (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. 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) (SC-25)
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.
@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}
}

Journal Article:
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    Works referencing / citing this record:

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