A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter

Abstract

An excess of $\sim$10-20 GeV cosmic-ray antiprotons has been identified in the spectrum reported by the AMS-02 Collaboration. The systematic uncertainties associated with this signal, however, have made it difficult to interpret these results. In this paper, we revisit the uncertainties associated with the time, charge and energy-dependent effects of solar modulation, the antiproton production cross section, and interstellar cosmic-ray propagation. After accounting for these uncertainties, we confirm the presence of a 4.7$\sigma$ antiproton excess, consistent with that arising from a $m_{\chi }\approx 64-88$ GeV dark matter particle annihilating to $b\bar{b}$ with a cross section of $\sigma v\simeq (0.8-5.2)\times 10^{-26}$ cm${}^3$/s. If we allow for the stochastic acceleration of secondary antiprotons in supernova remnants, the data continues to favor a similar range of dark matter models ($m_{\chi }\approx 46-94$ GeV, $\sigma v\approx (0.7-3.8)\times 10^{-26}$ cm${}^3/$s) with a significance of 3.3$\sigma$. 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.

13 pages, 9 figures and one appendix, changes in v2 in agreement with published version, small revisions in text, results and conclusions unchanged

References in corpus (19)

• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Background model systematics for the Fermi GeV excess
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• The origin of the positron excess in cosmic rays
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• WIMPs at the Galactic Center
• Testing astrophysical models for the PAMELA positron excess with cosmic ray nuclei
• The galactic antiproton spectrum at high energies: background expectation vs. exotic contributions
• Updated cosmic-ray and radio constraints on light dark matter: Implications for the GeV gamma-ray excess at the Galactic center
• Production of Mesons and Baryons at High Rapidity and High Pt in Proton-Proton Collisions at sqrt(s) = 200 GeV
• What Does The PAMELA Antiproton Spectrum Tell Us About Dark Matter?
• New calculation of antiproton production by cosmic ray protons and nuclei
• The Role of Antimatter Searches in the Hunt for Supersymmetric Dark Matter
• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
• The Cosmic Ray Antiproton Background for AMS-02
• Stochastic cosmic ray sources and the TeV break in the all-electron spectrum
• Hidden Sector Dark Matter and the Galactic Center Gamma-Ray Excess: A Closer Look

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