Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center

Abstract

Detection of gamma rays from dark matter annihilation in the galactic center is one of the feasible techniques to search for dark matter. We evaluate the gamma ray flux in the case that the dark matter has an electroweak SU(2)_L charge. Such dark matter is realized in the minimal supersymmetric standard model (MSSM) when the lightest SUSY particle is the Higgsino- or Wino-like neutralino. When the dark matter is heavy compared to the weak gauge bosons, the leading-order calculation of the annihilation cross sections in perturbation breaks down due to a threshold singularity. We take into account non-perturbative effects by using the non-relativistic effective theory for the two-body states of the dark matter and its SU(2)_L partner(s), and evaluate precise cross sections relevant to the gamma ray fluxes. We find that the annihilation cross sections may be enhanced by several orders of magnitude due to resonances when the dark matter mass is larger than 1 TeV. Furthermore, the annihilation cross sections in the MSSM may be changed by factors even when the mass is about 500 GeV. We also discuss sensitivities to gamma ray signals from the galactic center in the GLAST satellite detector and the large Air Cerenkov Telescope arrays.

44 pages, 25 figures, some typos in Sec.V-2 (related to fitting functions) corrected

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• Cosmology and the Dark Matter Frontier
• Gamma rays from Dark Matter Annihilation in Three-loop Radiative Neutrino Mass Generation Models
• Neutron Production Rates by Inverse-Beta Decay in Fully Ionized Plasmas
• Dark Resonance
• Cosmological prior for the $J$-factor estimation of dwarf spheroidal galaxies
• Universal bound states and resonances with Coulomb plus short-range potentials
• Prospects of Indirect Detection for the Heavy S3 Dark Doublet
• Renormalization Effects on Electric Dipole Moments in Electroweakly Interacting Massive Particle Models
• Non-relativistic high-energy physics: top production and dark matter annihilation
• Heavy neutralino relic abundance with Sommerfeld enhancements - a study of pMSSM scenarios
• Non-relativistic pair annihilation of nearly mass degenerate neutralinos and charginos III. Computation of the Sommerfeld enhancements
• Smooth hybrid inflation in a supersymmetric axion model
• The Cosmic Ray Signature of Dark Matter Caustics
• Indirect Probe of Electroweak-Interacting Particles with Mono-Lepton Signatures at Hadron Colliders
• On Gauge Theories of Neutrino Masses and Dark Matter
• Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $\gamma$-ray signals
• Electroweak Dark Matter
• Gamma Lines and Dark Matter from Anomaly Cancellation
• Testing the predictions of axisymmetric distribution functions of galactic dark matter with hydrodynamical simulations
• Dark matter in natural supersymmetric extensions of the Standard Model
• A New Approach to Searching for Dark Matter Signals in Fermi-LAT Gamma Rays
• Minimal dark matter in $SU(5)$ grand unification
• Non-thermal production of Higgsino dark matter by late-decaying scalar fields
• Vector Dark Matter from the 5-Dimensional Representation of $SU(2{)}_L$
• Dark matter signals and cosmic ray anomalies in an extended seesaw model
• Phenomenology of the Hidden SU(2) Vector Dark Matter Model
• Thermal Real Scalar Triplet Dark Matter
• Flavor Symmetry and Proton Decay in PeV-Scale Supersymmetry
• Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies
• Polynomial Spectrum of Gamma Ray from Dark Matter
• Final state interactions at the threshold of Higgs boson pair production
• Semi-Annihilating Wino-Like Dark Matter
• Effective field theory for resonant wino dark matter
• Some Aspects of New CDM Models and CDM Detection Methods
• Non-perturbative Enhancement of Heavy Quark-Antiquark Pair Annihilation in the Quark-Gluon Plasma
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
• NLO electroweak potentials for minimal dark matter and beyond
• Gamma-ray line from electroweakly interacting non-abelian spin-1 dark matter
• Darkonia at Colliders