Scrutinizing the evidence for dark matter in cosmic-ray antiprotons

Abstract

Global fits of primary and secondary cosmic-ray (CR) fluxes measured by AMS-02 have great potential to study CR propagation models and search for exotic sources of antimatter such as annihilating dark matter (DM). Previous studies of AMS-02 antiprotons revealed a possible hint for a DM signal which, however, could be affected by systematic uncertainties. To test the robustness of such a DM signal, in this work we systematically study two important sources of uncertainties: the antiproton production cross sections needed to calculate the source spectra of secondary antiprotons and the potential correlations in the experimental data, so far not provided by the AMS-02 Collaboration. To investigate the impact of cross-section uncertainties we perform global fits of CR spectra including a covariance matrix determined from nuclear cross-section measurements. As an alternative approach, we perform a joint fit to both the CR and cross-section data. The two methods agree and show that cross-section uncertainties have a small effect on the CR fits and on the significance of a potential DM signal, which we find to be at the level of $3\sigma$. Correlations in the data can have a much larger impact. To illustrate this effect, we determine possible benchmark models for the correlations in a data-driven method. The inclusion of correlations strongly improves the constraints on the propagation model and, furthermore, enhances the significance of the DM signal up to above $5\sigma$. Our analysis demonstrates the importance of providing the covariance of the experimental data, which is needed to fully exploit their potential.

arXiv comment25 pages,12 figures; v2: Figs. 8 and 12 added, references added, minor improvements in presentation, matches published version

References in corpus (66)

• The Structure of Cold Dark Matter Halos
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Cosmic-ray propagation and interactions in the Galaxy
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Limits and Confidence Intervals in the Presence of Nuisance Parameters
• Diffuse continuum gamma rays from the Galaxy
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Secondary antiprotons and propagation of cosmic rays in the Galaxy and heliosphere
• A New $\Sigma -D$ Relation and Its Application to the Galactic Supernova Remnant Distribution
• The dark matter density at the Sun's location
• Antiprotons in cosmic rays from neutralino annihilation
• Cosmic-Ray Proton and Helium Spectra from the First CREAM Flight
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Novel dark matter constraints from antiprotons in the light of AMS-02
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Possible dark matter annihilation signal in the AMS-02 antiproton data
• Cosmic antiprotons as a probe for supersymmetric dark matter?
• Interpretation of AMS-02 electrons and positrons data
• A Precision Search for WIMPs with Charged Cosmic Rays
• A Markov Chain Monte Carlo technique to sample transport and source parameters of Galactic cosmic rays: II. Results for the diffusion model combining B/C and radioactive nuclei
• PICARD: A novel code for the Galactic Cosmic Ray propagation problem
• Measurements of ${\pi }^{\pm }$, K${}^{\pm }$, p and $\bar{\text{p}}$ spectra in proton-proton interactions at 20, 31, 40, 80 and 158 GeV/c with the NA61/SHINE spectrometer at the CERN SPS
• Dark Matter's secret liaisons: phenomenology of a dark U(1) sector with bound states
• The galactic antiproton spectrum at high energies: background expectation vs. exotic contributions
• Antiprotons from dark matter annihilation in the Galaxy: astrophysical uncertainties
• Constraints on the distribution of supernova remnants with Galactocentric radius
• A Predictive Analytic Model for the Solar Modulation of Cosmic Rays
• A new evaluation of the antiproton production cross section for cosmic ray studies
• Updated cosmic-ray and radio constraints on light dark matter: Implications for the GeV gamma-ray excess at the Galactic center
• Prospects to verify a possible dark matter hint in cosmic antiprotons with antideuterons and antihelium
• Cosmic Ray Antiprotons at High Energies
• Inclusive production of protons, anti-protons and neutrons in p+p collisions at 158 GeV/c beam momentum
• Constraining heavy dark matter with cosmic-ray antiprotons
• Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments
• What Does The PAMELA Antiproton Spectrum Tell Us About Dark Matter?
• Propagation of Cosmic Rays in Heliosphere: the HelMod Model
• New calculation of antiproton production by cosmic ray protons and nuclei
• Cosmic-ray propagation with DRAGON2: II. Nuclear interactions with the interstellar gas
• AMS-02 Antiprotons Reloaded
• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
• Constraints on particle dark matter from cosmic-ray antiprotons
• Galactic cosmic-ray propagation in the light of AMS-02: I. Analysis of protons, helium, and antiprotons
• Probing dark matter annihilation in the Galaxy with antiprotons and gamma rays
• Low energy cosmic ray positron fraction explained by charge-sign dependent solar modulation
• Measurement of antiproton production in $\mathrm{pHe}$ collisions at $\sqrt{s_{NN}}=110$ GeV
• The Cosmic Ray Antiproton Background for AMS-02
• Theoretical uncertainties in extracting cosmic-ray diffusion parameters: the boron-to-carbon ratio
• Secondary antiprotons as a Galactic Dark Matter probe
• Solar and nuclear physics uncertainties in cosmic-ray propagation
• A fussy revisitation of antiprotons as a tool for Dark Matter searches
• SOLARPROP: Charge-sign Dependent Solar Modulation for Everyone
• Revisit of cosmic ray antiprotons from dark matter annihilation with updated constraints on the background model from AMS-02 and collider data
• Hidden sector explanation of $B$-decay and cosmic ray anomalies
• Constraints on leptophilic dark matter from the AMS-02 experiment
• The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
• Prescriptions on antiproton cross section data for precise theoretical antiproton flux predictions
• Hidden Sector Dark Matter and the Galactic Center Gamma-Ray Excess: A Closer Look
• A systematic study on the cosmic ray antiproton flux
• Can AMS-02 discriminate the origin of an anti-proton signal?
• Dark Matter Annihilation into Four-Body Final States and Implications for the AMS Antiproton Excess
• Antiproton signatures from astrophysical and dark matter sources at the galactic center
• The Fluorescence detector Array of Single-pixel Telescopes: Contributions to the 35th International Cosmic Ray Conference (ICRC 2017)
• Interpretation of the gamma-ray excess and AMS-02 antiprotons: Velocity dependent dark matter annihilations
• Cosmic-ray transport in the heliosphere with HelioProp
• Revisiting simplified dark matter models in terms of AMS-02 and Fermi-LAT

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