Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios

Abstract

We study the production of gamma rays via LSP annihilations in the core of the Galaxy as a possible experimental signature of the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which supersymmetry-breaking parameters are assumed to be universal at the GUT scale, assuming also that the LSP is the lightest neutralino chi. The part of the CMSSM parameter space that is compatible with the measured astrophysical density of cold dark matter is known to include a stau_1 - chi coannihilation strip, a focus-point strip where chi has an enhanced Higgsino component, and a funnel at large tanb where the annihilation rate is enhanced by the poles of nearby heavy MSSM Higgs bosons, A/H. We calculate the total annihilation rates, the fractions of annihilations into different Standard Model final states and the resulting fluxes of gamma rays for CMSSM scenarios along these strips. We observe that typical annihilation rates are much smaller in the coannihilation strip for tanb = 10 than along the focus-point strip or for tanb = 55, and that the annihilation branching ratios differ greatly between the different dark matter strips. Whereas the current Fermi-LAT data are not sensitive to any of the CMSSM scenarios studied, and the calculated gamma-ray fluxes are probably unobservably low along the coannihilation strip for tanb = 10, we find that substantial portions of the focus-point strips and rapid-annihilation funnel regions could be pressured by several more years of Fermi-LAT data, if understanding of the astrophysical background and/or systematic uncertainties can be improved in parallel.

33 pages, 12 figures, comments and references added, version to appear in JCAP

References in corpus (41)

• PYTHIA 6.4 Physics and Manual
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• 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
• Reevaluation of the Hadronic Contributions to the Muon g-2 and to alpha(MZ)
• Search for Neutral MSSM Higgs Bosons at LEP
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• Muon g-2: Review of Theory and Experiment
• Search for a Dark Matter annihilation signal from the Galactic Center halo with H.E.S.S
• The Muon Magnetic Moment and Supersymmetry
• New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
• Neutrino Constraints on the Dark Matter Total Annihilation Cross Section
• Pre-launch estimates for GLAST sensitivity to Dark Matter annihilation signals
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• Wild at Heart:-The Particle Astrophysics of the Galactic Centre
• Multi-wavelength signals of dark matter annihilations at the Galactic center
• Likelihood Functions for Supersymmetric Observables in Frequentist Analyses of the CMSSM and NUHM1
• On the Importance of Electroweak Corrections for Majorana Dark Matter Indirect Detection
• Searches for Dark Matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
• W/Z Bremsstrahlung as the Dominant Annihilation Channel for Dark Matter, Revisited
• Predictions for Supersymmetric Particle Masses in the CMSSM using Indirect Experimental and Cosmological Constraints
• Fitting formulae for photon spectra from WIMP annihilation
• Photon spectra from WIMP annihilation
• Hunting Dark Matter Gamma-Ray Lines with the Fermi LAT
• Electroweak Bremsstrahlung in Dark Matter Annihilation
• The Sommerfeld enhancement for scalar particles and application to sfermion co-annihilation regions
• Implications of Initial LHC Searches for Supersymmetry
• Extracting the Gamma Ray Signal from Dark Matter Annihilation in the Galactic Center Region
• Complementarity of direct dark matter detection and indirect detection through gamma-rays
• Dark Matter Annihilation Signatures from Electroweak Bremsstrahlung
• Angular Signatures of Dark Matter in the Diffuse Gamma Ray Background
• The Quest for Supersymmetry: Early LHC Results versus Direct and Indirect Neutralino Dark Matter Searches
• Constraining Dark Matter in Galactic Substructure
• Neutrino Fluxes from NUHM LSP Annihilations in the Sun
• The impact of propagation uncertainties on the potential Dark Matter contribution to the Fermi LAT mid-latitude gamma-ray data
• A Robust Approach to Constraining Dark Matter from Gamma-Ray Data
• A comparison between the detection of gamma rays and positrons from neutralino annihilation
• Galactic Magnetic Turbulence from Radio data

Cited by in corpus (14)

• Revisiting the Higgs Mass and Dark Matter in the CMSSM
• Likelihood Analysis of the pMSSM11 in Light of LHC 13-TeV Data
• Probing Dark Matter Decay and Annihilation with Fermi LAT Observations of Nearby Galaxy Clusters
• Small-scale clumps of dark matter
• Very light right-handed sneutrino dark matter in the NMSSM
• Probing neutralino dark matter in the MSSM & the NMSSM with directional detection
• Constraints on the dark matter annihilation from Fermi-LAT observation of M31
• New gamma ray signal from gravitationally boosted neutralinos at the galactic center
• The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and IceCube
• Dilaton dominance relaxes LHC and cosmological constraints in supersymmetric models
• An Enhanced Cosmological Li6 Abundance as a Potential Signature of Residual Dark Matter Annihilations
• Indirect Dark Matter Searches and Models
• The Price of a Dark Matter Annihilation Interpretation of AMS-02 Data
• Casting Light on Dark Matter