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Title: Galactic-centre gamma rays in CMSSM dark matter scenarios

Abstract

We study the production of γ 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 χ. The part of the CMSSM parameter space that is compatible with the measured astrophysical density of cold dark matter is known to include a (τ-tilde {sub 1})−χ coannihilation strip, a focus-point strip where χ has an enhanced Higgsino component, and a funnel at large tan β 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 γ rays for CMSSM scenarios along these strips. We observe that typical annihilation rates are much smaller in the coannihilation strip for tan β = 10 than along the focus-point strip or for tan β = 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 ofmore » the CMSSM scenarios studied, and the calculated γ-ray fluxes are probably unobservably low along the coannihilation strip for tan β = 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.« less

Authors:
 [1];  [2];  [3]
  1. TH Division, Physics Department, CERN, CH-1211 Geneva 23 (Switzerland)
  2. William I. Fine Theoretical Physics Institute and Department of Physics, University of Minnesota, Minneapolis, MN 55455 (United States)
  3. Institute of Nuclear Physics, NCSR ''Demokritos'', GR-15310 Athens (Greece)
Publication Date:
OSTI Identifier:
22280235
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ASTROPHYSICS; BRANCHING RATIO; COSMOLOGY; GALAXIES; GAMMA RADIATION; HIGGS BOSONS; NEUTRALINOS; NONLUMINOUS MATTER; STANDARD MODEL; SUPERSYMMETRY; SYMMETRY BREAKING; VISIBLE RADIATION

Citation Formats

Ellis, John, Olive, Keith A., and Spanos, Vassilis C., E-mail: john.ellis@cern.ch, E-mail: olive@physics.umn.edu, E-mail: spanos@inp.demokritos.gr. Galactic-centre gamma rays in CMSSM dark matter scenarios. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/10/024.
Ellis, John, Olive, Keith A., & Spanos, Vassilis C., E-mail: john.ellis@cern.ch, E-mail: olive@physics.umn.edu, E-mail: spanos@inp.demokritos.gr. Galactic-centre gamma rays in CMSSM dark matter scenarios. United States. doi:10.1088/1475-7516/2011/10/024.
Ellis, John, Olive, Keith A., and Spanos, Vassilis C., E-mail: john.ellis@cern.ch, E-mail: olive@physics.umn.edu, E-mail: spanos@inp.demokritos.gr. Sat . "Galactic-centre gamma rays in CMSSM dark matter scenarios". United States. doi:10.1088/1475-7516/2011/10/024.
@article{osti_22280235,
title = {Galactic-centre gamma rays in CMSSM dark matter scenarios},
author = {Ellis, John and Olive, Keith A. and Spanos, Vassilis C., E-mail: john.ellis@cern.ch, E-mail: olive@physics.umn.edu, E-mail: spanos@inp.demokritos.gr},
abstractNote = {We study the production of γ 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 χ. The part of the CMSSM parameter space that is compatible with the measured astrophysical density of cold dark matter is known to include a (τ-tilde {sub 1})−χ coannihilation strip, a focus-point strip where χ has an enhanced Higgsino component, and a funnel at large tan β 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 γ rays for CMSSM scenarios along these strips. We observe that typical annihilation rates are much smaller in the coannihilation strip for tan β = 10 than along the focus-point strip or for tan β = 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 γ-ray fluxes are probably unobservably low along the coannihilation strip for tan β = 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.},
doi = {10.1088/1475-7516/2011/10/024},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2011,
place = {United States},
year = {2011},
month = {10}
}