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Title: A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter

Journal Article · · Physical Review D

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.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1529338
Alternate ID(s):
OSTI ID: 1523690
Report Number(s):
arXiv:1903.02549; FERMILAB-PUB-19-091-A; 1723895
Journal Information:
Physical Review D, Journal Name: Physical Review D Journal Issue: 10 Vol. 99; ISSN PRVDAQ; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

A black box for dark sector physics: predicting dark matter annihilation feedback with conditional GANs journal October 2019
$Z'$ Mediated WIMPs: Dead, Dying, or Soon to be Detected? text January 2019
The Return of the WIMP: Missing Energy Signals and the Galactic Center Excess text January 2019
A global view of the off-shell Higgs portal journal January 2020
Investigating the dark matter signal in the cosmic ray antiproton flux with the machine learning method journal November 2019
Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies journal August 2019
Gamma-Ray Polarimetry: A New Window for the Nonthermal Universe journal September 2019
Heavy dark matter particle annihilation in dwarf spheroidal galaxies: Radio signals at the SKA telescope journal January 2020
Z ′ mediated WIMPs: dead, dying, or soon to be detected? journal November 2019
Fermi -LAT Observations of γ -Ray Emission toward the Outer Halo of M31 journal July 2019
Remnants of Galactic subhalos and their impact on indirect dark matter searches text January 2019
(Not as) Big as a Barn: Upper Bounds on Dark Matter-Nucleus Cross Sections text January 2019
A Novel Scheme for Dark Matter Annihilation Feedback in Cosmological Simulations text January 2019
Annihilation signatures of hidden sector dark matter within early-forming microhalos journal November 2019
A novel scheme for Dark Matter Annihilation Feedback in cosmological simulations journal August 2019
Fermi-LAT Observations of Gamma-Ray Emission Towards the Outer Halo of M31 conference July 2019
Remnants of Galactic Subhalos and Their Impact on Indirect Dark-Matter Searches journal June 2019
Not as big as a barn: Upper bounds on dark matter-nucleus cross sections journal September 2019
Gamma Ray polarimetry; a new window for the non-thermal Universe text January 2019
Return of the WIMP: Missing energy signals and the Galactic Center excess journal September 2019

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