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Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios

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, assum...

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Detalles Bibliográficos
Autores principales: Ellis, John, Olive, Keith A., Spanos, Vassilis C.
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2011/10/024
http://cds.cern.ch/record/1356663
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author Ellis, John
Olive, Keith A.
Spanos, Vassilis C.
author_facet Ellis, John
Olive, Keith A.
Spanos, Vassilis C.
author_sort Ellis, John
collection CERN
description 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.
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spelling cern-13566632019-09-30T06:29:59Zdoi:10.1088/1475-7516/2011/10/024http://cds.cern.ch/record/1356663engEllis, JohnOlive, Keith A.Spanos, Vassilis C.Galactic-Centre Gamma Rays in CMSSM Dark Matter ScenariosParticle Physics - PhenomenologyWe 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.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.CERN-PH-TH-2011-130KCL-PH-TH-2011-13LCTS-2011-02FTPI-MINN-11-14UMN-TH-3004-11arXiv:1106.0768CERN-PH-TH-2011-130KCL-PH-TH-2011-13LCTS-2011-02UMN-TH-3004-11FTPI-MINN-11-14oai:cds.cern.ch:13566632011-06-07
spellingShingle Particle Physics - Phenomenology
Ellis, John
Olive, Keith A.
Spanos, Vassilis C.
Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
title Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
title_full Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
title_fullStr Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
title_full_unstemmed Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
title_short Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
title_sort galactic-centre gamma rays in cmssm dark matter scenarios
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1088/1475-7516/2011/10/024
http://cds.cern.ch/record/1356663
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AT olivekeitha galacticcentregammaraysincmssmdarkmatterscenarios
AT spanosvassilisc galacticcentregammaraysincmssmdarkmatterscenarios