Vector Fermion-Portal Dark Matter: Direct Detection and Galactic Center Gamma-Ray Excess

Abstract

We investigate a neutral gauge boson X originated from a hidden U(1) extension of the standard model as the particle dark matter candidate. The vector dark matter interacts with the standard model fermions through heavy fermion mediators. The interactions give rise to t-channel annihilation cross section in the XX to ff process, which dominates the thermal relic abundance during thermal freeze-out and produces measurable gamma-ray flux in the galactic halo. For a light vector dark matter, if it predominantly couples to the third generation fermions, this model could explain the excess of gamma rays from the galactic center. We show that the vector dark matter with a mass of 20 ~ 40 GeV and that annihilate into the bb and tautau final states provides an excellent description of the observed gamma-ray excess. The parameter space aimed at explaining the gamma-ray excess, could also provide the correct thermal relic density and is compatible with the constraints from electroweak precision data, Higgs invisible decay, and collider searches. We also show the dark matter couplings to the nucleon from the fermion portal interactions are loop-suppressed, and only contribute to the spin-dependent cross section. So the vector dark matter could easily escape the stringent constraints from the direct detection experiments.

18 pages, 14 figures, references updated in revised version

References in corpus (25)

• Dark Matter Results from 225 Live Days of XENON100 Data
• Gauge Singlet Scalars as Cold Dark Matter
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• Search for Low-Mass WIMPs with SuperCDMS
• First dark matter search results from a 4-kg CF${}_3$I bubble chamber operated in a deep underground site
• Constraints on Low-Mass WIMP Interactions on 19F from PICASSO
• 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
• Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Search for direct top-squark pair production in final states with two leptons in pp collisions at sqrt(s)=8TeV with the ATLAS detector
• Singlet fermionic dark matter
• 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 minimal model of fermionic dark matter
• A weighty interpretation of the Galactic Centre excess
• Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• VDM: A model for Vector Dark Matter
• The Galactic Center Excess from the Bottom Up
• Stabilizing Electroweak Vacuum in a Vector-like Fermion Model
• Cosmic Positron Signature from Dark Matter in the Littlest Higgs Model with T-parity
• Kaluza-Klein Dark Matter: Direct Detection vis-a-vis LHC
• Bounds on dark matter interpretation of Fermi-LAT GeV excess
• Nucleon Form Factors of the Isovector Axial-Vector Current: Situation of Experiments and Theory
• Reanalysis of nuclear spin matrix elements for dark matter spin-dependent scattering

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• WIMPs at the Galactic Center
• Searching for lepton portal dark matter with colliders and gravitational waves
• Tau Portal Dark Matter models at the LHC
• Vector dark matter annihilation with internal bremsstrahlung
• Vector dark matter from split SU(2) gauge bosons
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Impact of the vector dark matter on polarization of the CMB photon
• Hidden SU(2)_D vector dark matter with a scalar septuplet
• Phenomenology of the Hidden SU(2) Vector Dark Matter Model
• Chromo-Rayleigh Interactions of Dark Matter