Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis

Abstract

A GeV gamma-ray excess has possibly been individuated in Fermi-LAT data from the Galactic Center and interpreted in terms of Dark Matter (DM) annihilations, either in hadronic (essentially $b\bar{b}$) or leptonic channels. In order to test this tantalizing interpretation, we address two issues: (i) we improve the computation of secondary emission from DM (Inverse Compton and Bremsstrahlung) with respect to previous works, confirming it to be very relevant for determining the DM spectrum in the leptonic channels, so that any conclusion on the DM nature of the signal critically depends on this contribution; (ii) we consider the constraints from antiprotons on the DM hadronic channel, finding that the uncertainties on the propagation model, and in particular on the halo height, play a major role. Moreover, we discuss the role of solar modulation, taking into account possible charge dependent effects whose importance is estimated exploiting detailed numerical tools. The limits that we obtain severely constrain the DM interpretation of the excess in the hadronic channel, for standard assumptions on the Galactic propagation parameters and solar modulation. However, they considerably relax if more conservative choices are adopted.

arXiv comment22 pages, 6 figures, 2 tables

References in corpus (54)

• The Structure of Cold Dark Matter Halos
• PAMELA Measurements of Cosmic-ray Proton and Helium Spectra
• Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Diffuse continuum gamma rays from the Galaxy
• PAMELA results on the cosmic-ray antiproton flux from 60 MeV to 180 GeV in kinetic energy
• On The Origin Of The Gamma Rays From The Galactic Center
• Detection of a Gamma-Ray Source in the Galactic Center Consistent with Extended Emission from Dark Matter Annihilation and Concentrated Astrophysical Emission
• Dark Matter and Pulsar Model Constraints from Galactic Center Fermi-LAT Gamma Ray Observations
• Astrophysical and Dark Matter Interpretations of Extended Gamma-Ray Emission from the Galactic Center
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Antiprotons from spallations of cosmic rays on interstellar matter
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Simplified Dark Matter Models for the Galactic Center Gamma-Ray Excess
• A Renormalizable Model for the Galactic Center Gamma Ray Excess from Dark Matter Annihilation
• The Consistency of Fermi-LAT Observations of the Galactic Center with a Millisecond Pulsar Population in the Central Stellar Cluster
• A comment on the emission from the Galactic Center as seen by the Fermi telescope
• Cosmic Ray Protons in the Inner Galaxy and the Galactic Center Gamma-Ray Excess
• Pulsars Cannot Account for the Inner Galaxy's GeV Excess
• Extended gamma-ray emission from Coy Dark Matter
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Fitting the Galactic Center Gamma-Ray Excess with Cascade Annihilations
• Galactic Center gamma-ray "excess" from an active past of the Galactic Centre?
• Flavored Dark Matter and the Galactic Center Gamma-Ray Excess
• Higgs portal vector dark matter for $\mathrm{GeV}$ scale $\gamma$-ray excess from galactic center
• The Effective Hooperon
• Antiprotons from dark matter annihilation in the Galaxy: astrophysical uncertainties
• A weighty interpretation of the Galactic Centre excess
• Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station
• Antiprotons from Dark Matter: Current constraints and future sensitivities
• NMSSM Interpretation of the Galactic Center Excess
• Cosmic Ray Electrons, Positrons and the Synchrotron emission of the Galaxy: consistent analysis and implications
• Updated cosmic-ray and radio constraints on light dark matter: Implications for the GeV gamma-ray excess at the Galactic center
• The Galactic Center Excess from the Bottom Up
• A common solution to the cosmic ray anisotropy and gradient problems
• Millisecond pulsar interpretation of the Galactic center gamma-ray excess
• On the role of electroweak bremsstrahlung for indirect dark matter signatures
• Fitting the Fermi-LAT GeV excess: On the importance of including the propagation of electrons from dark matter
• What if Dark Matter Gamma-Ray Lines come with Gluon Lines?
• Constraints on particle dark matter from cosmic-ray antiprotons
• Diffuse gamma-ray emission from galactic pulsars
• Low energy cosmic ray positron fraction explained by charge-sign dependent solar modulation
• Antiproton constraints on dark matter annihilations from internal electroweak bremsstrahlung
• Radio data and synchrotron emission in consistent cosmic ray models
• PAMELA and AMS-02 positron and electron spectra are reproduced by three-dimensional cosmic-ray modeling
• Bremsstrahlung gamma rays from light Dark Matter
• Bounds on dark matter interpretation of Fermi-LAT GeV excess
• The isotropic radio background revisited
• TeV scale Dark Matter and electroweak radiative corrections
• Fermi Bubbles under Dark Matter Scrutiny Part II: Particle Physics Analysis
• PAMELA and FERMI-LAT limits on the neutralino-chargino mass degeneracy
• Coy Dark Matter and the anomalous magnetic moment
• Light dark matter for Fermi-LAT and CDMS observations

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• A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter
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• The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations
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• Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
• A description of the Galactic Center excess in the Minimal Supersymmetric Standard Model
• Gamma-rays from Dark Showers with Twin Higgs Models
• Secondary antiprotons as a Galactic Dark Matter probe
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• Distinguishing Dark Matter from Unresolved Point Sources in the Inner Galaxy with Photon Statistics
• Signals of a Light Dark Force in the Galactic Center
• SUSY explanation of the Fermi Galactic Center Excess and its test at LHC Run-II
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• SUSY Implications from WIMP Annihilation into Scalars at the Galactic Centre
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• Extending LHC Coverage to Light Pseudoscalar Mediators and Coy Dark Sectors
• FLUKA cross sections for cosmic-ray interactions with the DRAGON2 code
• Radiative Neutrino Mass with $Z_3$ Dark matter: From Relic Density to LHC Signatures
• The Spatial Morphology of the Secondary Emission in the Galactic Center Gamma-Ray Excess
• Time dependent solar modulation of cosmic rays from solar minimum to solar maximum
• Entering the Era of Dark Matter Astronomy? Near to Long-Term Forecasts in X-Ray and Gamma-Ray Bands
• MSSM A-funnel and the Galactic Center Excess: Prospects for the LHC and Direct Detection Experiments
• Anti-Deuterons and Anti-Helium Nuclei from Annihilating Dark Matter
• Constraining dark matter annihilation with cosmic ray antiprotons using neural networks
• Dark Higgs Channel for FERMI GeV $\gamma$-ray Excess
• Cosmic-ray antiprotons in the AMS-02 era: A sensitive probe of dark matter
• Muon g-2 and galactic centre $\gamma$-ray excess in a scalar extension of the 2HDM type-X
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• Inverse Compton emission from millisecond pulsars in the Galactic bulge
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• On self-gravitating strange dark matter halos around galaxies
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• Interpreting the Fermi-LAT gamma ray excess in the simplified framework
• An excess of excesses examined via dark matter radio emissions from galaxies
• Phenomenology of Colored Radiative Neutrino Mass Model and Its Implications on the Cosmic-ray Observations
• AMS-02 antiprotons and dark matter: Trimmed hints and robust bounds
• Reconciling Higgs physics and pseudo-Nambu-Goldstone dark matter in the S2HDM using a genetic algorithm