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.

22 pages, 6 figures, 2 tables

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Cited by in corpus (22)

• Background model systematics for the Fermi GeV excess
• The ALICE experiment: a journey through QCD
• WIMPs at the Galactic Center
• Gamma-ray sky points to radial gradients in cosmic-ray transport
• Scrutinizing the evidence for dark matter in cosmic-ray antiprotons
• What Does The PAMELA Antiproton Spectrum Tell Us About Dark Matter?
• The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations
• Unveiling Hidden Physics at the LHC
• Distinguishing Dark Matter from Unresolved Point Sources in the Inner Galaxy with Photon Statistics
• SUSY explanation of the Fermi Galactic Center Excess and its test at LHC Run-II
• A fussy revisitation of antiprotons as a tool for Dark Matter searches
• 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
• Constraining dark matter annihilation with cosmic ray antiprotons using neural networks
• Cosmic-ray antiprotons in the AMS-02 era: A sensitive probe of dark matter
• Antiproton signatures from astrophysical and dark matter sources at the galactic center
• Inverse Compton emission from millisecond pulsars in the Galactic bulge
• Probing Gravitational Dark Matter
• 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