Multimediator models for the galactic center gamma ray excess

Abstract

Tentative evidence for excess GeV-scale gamma rays from the galactic center has been corroborated by several groups, including the Fermi collaboration, on whose data the observation is based. Dark matter annihilation into standard model particles has been shown to give a good fit to the signal for a variety of final state particles, but generic models are inconsistent with constraints from direct detection. Models where the dark matter annihilates to mediators that subsequently decay are less constrained. We perform global fits of such models to recent data, allowing branching fractions to all possible fermionic final states to vary. The best fit models, including constraints from the AMS-02 experiment (and also antiproton ratio), require branching primarily to muons, with a $\sim 10-20\%$ admixture of $b$ quarks, and no other species. This suggests models in which there are two scalar mediators that mix with the Higgs, and have masses consistent with such a decay pattern. The scalar that decays to ${\mu }^{+}{\mu }^{-}$ must therefore be lighter than $2m_{\tau }\cong 3.6$ GeV. Such a small mass can cause Sommerfeld enhancement, which is useful to explain why the best-fit annihilation cross section is larger than the value needed for a thermal relic density. For light mediator masses $\sim (0.2-2)$ GeV, it can also naturally lead to elastic DM self-interactions at the right level for addressing discrepancies in small structure formation as predicted by collisionless cold dark matter.

18 pages, 14 figures; v2: updated CMB constraint and added references; v3 corrected direct detection cross section

References in corpus (58)

• A Theory of Dark Matter
• Background model systematics for the Fermi GeV excess
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Measurement of the Higgs boson mass from the $H\to \gamma \gamma$ and $H\to Z{Z}^{\ast }\to 4\ell$ channels with the ATLAS detector using 25 fb${}^{-1}$ of $pp$ collision data
• Simplified Dark Matter Models for the Galactic Center Gamma-Ray Excess
• Measurements of Higgs boson production and couplings in the four-lepton channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• A taste of dark matter: Flavour constraints on pseudoscalar mediators
• A Renormalizable Model for the Galactic Center Gamma Ray Excess from Dark Matter Annihilation
• Resonant Dark Forces and Small Scale Structure
• Search for the $b\bar{b}$ decay of the Standard Model Higgs boson in associated $(W/Z)H$ production with the ATLAS detector
• Cosmic Ray Protons in the Inner Galaxy and the Galactic Center Gamma-Ray Excess
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Dark Nuclei I: Cosmology and Indirect Detection
• Fitting the Galactic Center Gamma-Ray Excess with Cascade Annihilations
• Galactic Center gamma-ray "excess" from an active past of the Galactic Centre?
• Millisecond pulsars and the Galactic Center gamma-ray excess: the importance of luminosity function and secondary emission
• 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 windows for kinetically mixed Z'-mediated dark matter and the galactic center gamma ray excess
• Not so Coy Dark Matter explains DAMA (and the Galactic Center excess)
• The Effective Hooperon
• Galactic Center Gamma-Ray Excess from Dark Matter Annihilation: Is There A Black Hole Spike?
• Dark Matter Signals from Cascade Annihilations
• A weighty interpretation of the Galactic Centre excess
• Hidden Sector Dark Matter Models for the Galactic Center Gamma-Ray Excess
• NMSSM Interpretation of the Galactic Center Excess
• 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
• Multi-Step Cascade Annihilations of Dark Matter and the Galactic Center Excess
• Light Neutralino Dark Matter: Direct/Indirect Detection and Collider Searches
• Fermionic dark matter with pseudo-scalar Yukawa interaction
• Galactic center $\gamma$-ray excess in hidden sector DM models with dark gauge symmetries: local $Z_3$ symmetry as an example
• What Does The PAMELA Antiproton Spectrum Tell Us About Dark Matter?
• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
• Low-mass right-handed sneutrino dark matter: SuperCDMS and LUX constraints and the Galactic Centre gamma-ray excess
• A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess
• Dark Matter CMB Constraints and Likelihoods for Poor Particle Physicists
• Z' Mediated Dark Matter Models for the Galactic Center Gamma-Ray Excess
• Supersymmetric Sub-Electroweak Scale Dark Matter, the Galactic Center Gamma-ray Excess, and Exotic Decays of the 125 GeV Higgs Boson
• Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line
• Towards a Supersymmetric Description of the Fermi Galactic Center Excess
• Class of Higgs-portal Dark Matter models in the light of gamma-ray excess from Galactic center
• SUSY explanation of the Fermi Galactic Center Excess and its test at LHC Run-II
• Testing the millisecond pulsar scenario of the Galactic center gamma-ray excess with very high energy gamma-rays
• Annihilating Asymmetric Dark Matter
• Galactic Centre GeV Photons from Dark Technicolor
• SUSY Implications from WIMP Annihilation into Scalars at the Galactic Centre
• Bounds on dark matter interpretation of Fermi-LAT GeV excess
• Galactic Center gamma-ray excess from two-Higgs-doublet-portal dark matter
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• Vector Fermion-Portal Dark Matter: Direct Detection and Galactic Center Gamma-Ray Excess
• Galactic Center Gamma-Ray Excess through a Dark Shower
• Extending LHC Coverage to Light Pseudoscalar Mediators and Coy Dark Sectors
• Simplified Dark Matter Models Confront the Gamma Ray Excess
• Confronting the Galactic Center Gamma Ray Excess With a Light Scalar Dark Matter
• A 3.55 keV Line from Exciting Dark Matter without a Hidden Sector
• On-Shell Mediators and Top-Charm Dark Matter Models for the Fermi-LAT Galactic Center Excess

Cited by in corpus (38)

• Model-Independent Indirect Detection Constraints on Hidden Sector Dark Matter
• Dark Matter's secret liaisons: phenomenology of a dark U(1) sector with bound states
• Twin Higgs WIMP Dark Matter
• The High-Energy Tail of the Galactic Center Gamma-Ray Excess
• The Gamma-Ray Luminosity Function of Millisecond Pulsars and Implications for the GeV Excess
• The Gamma-Ray Pulsar Population of Globular Clusters: Implications for the GeV Excess
• Secluded singlet fermionic dark matter driven by the Fermi gamma-ray excess
• Low Mass X-Ray Binaries in the Inner Galaxy: Implications for Millisecond Pulsars and the GeV Excess
• Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess
• Model-independent analysis of the DAMPE excess
• Dark Forces in the Sky: Signals from Z' and the Dark Higgs
• Evidence of TeV Halos Around Millisecond Pulsars
• TeV dark matter and the DAMPE electron excess
• Type-III two Higgs doublet model plus a pseudoscalar confronted with $h\to \mu \tau$, muon $g-2$ and dark matter
• On-shell mediator dark matter models and the Xenon1T anomaly
• Fermionic Semi-Annihilating Dark Matter
• Two-portal Dark Matter
• Radiative Neutrino Mass with $Z_3$ Dark matter: From Relic Density to LHC Signatures
• p-wave Annihilating Dark Matter from a Decaying Predecessor and the Galactic Center Excess
• Secluded WIMPs, QED with massive photons, and the galactic center gamma-ray excess
• A Systematic Study of Hidden Sector Dark Matter: Application to the Gamma-Ray and Antiproton Excesses
• Confronting Galactic center and dwarf spheroidal gamma-ray observations with cascade annihilation models
• Quark-flavored scalar dark matter
• Dark Higgs Channel for FERMI GeV $\gamma$-ray Excess
• Lepton-Flavor Violating Mediators
• Dark Matter, Shared Asymmetries, and Galactic Gamma Ray Signals
• Phenomenological analysis of multi-pseudoscalar mediated dark matter models
• Two-mediator dark matter models and cosmic electron excess
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Interpreting the Fermi-LAT gamma ray excess in the simplified framework
• Study of WIMP annihilations into a pair of on-shell scalar mediators
• Possible explanation of indirect gamma ray signatures from hidden sector fermionic dark matter
• Phenomenology of Colored Radiative Neutrino Mass Model and Its Implications on the Cosmic-ray Observations
• Quantum Simulations of Dark Sector Showers
• Dwarf Galaxy $\gamma$-excess and 3.55 keV X-ray Line In A Nonthermal Dark Matter Model
• Sommerfeld enhancement of invisible dark matter annihilation in galaxies and galaxy clusters
• Extended Higgs-portal dark matter and the Fermi-LAT Galactic Center Excess
• Dark matter properties implied by gamma ray interstellar emission models