Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios

John Ellis; Keith A. Olive; Vassilis C. Spanos

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Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios

John Ellis, Keith A. Olive, Vassilis C. Spanos

High Energy Physics - Phenomenology · Submitted 3 Jun 2011

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim 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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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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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	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.	contribution 0.98	0.74	0.04	hedged possibility 0.83
s1	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.	background 1.00	0.07	0.04	asserted 1.00
s2	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.	contribution 0.59	0.96	0.05	asserted 0.99
s3	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.	result 1.00	0.94	0.10	asserted 1.00
s4	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.	interpretation 0.74	0.93	0.79	hedged possibility 0.93

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Original 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.

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References

Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Likelihood Analysis of the pMSSM11 in Light of LHC 13-TeV Data
hep-ph 2017-10 conditional novelty 4.0 of 10

In a global fit of the 11-parameter MSSM, imposing the muon g-2 anomaly selects a Bino-like lightest neutralino with Wino or slepton coannihilation, while dropping it selects a Higgsino-like neutralino with Higgsino o...
Revisiting the Higgs Mass and Dark Matter in the CMSSM
hep-ph 2012-02 conditional novelty 4.0 of 10

Within the CMSSM, a 125 GeV Higgs boson would leave only the large-tan-beta, A0 > 0 stau-coannihilation and H/A funnel strips as viable thermal dark matter, with spin-independent scattering below about 10^-9 pb.
Probing Dark Matter Decay and Annihilation with Fermi LAT Observations of Nearby Galaxy Clusters
hep-ph 2011-10 conditional novelty 4.0 of 10

No significant gamma-ray emission is found from eight nearby galaxy clusters, and the resulting limits constrain dark matter lifetime and annihilation cross-section, with projected gains from substructure boosts.

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12 arXiv papers cite this in 22 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 10 sentences without a confident label

Builds on it 1 paper

(This plot updates the planes shown previously in [ref] .

Casting Light on Dark Matter · Supersymmetric Models · 0.81

Uses its method or tool 3 papers

In particular, the orange solid (dashed) curve corresponds to the Fermi-LAT data from the galactic center (GC) following the method of [ref] , assuming the Einasto (NFW) profie.

The Price of a Dark Matter Annihilation Interpretation of AMS-02 Data · DM interpretation of the AMS-02 positron data · 0.96
For the calculation of the supersymmetric signal we include the monochromatic, the continuum and inverse Compton scattering components as they are described in detail in [ref] .

Dilaton dominance relaxes LHC and cosmological constraints in supersymmetric models · INDIRECT DARK MATTER SEARCHES: $γ$-RAY FLUXES · 0.98
The production of $γ$ rays near the GC was studied as a possible signature of the CMSSM in [ref] , whose analysis we follow here.

The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and IceCube · Limit on $γ$ Flux from the Galactic Centre · 0.88

Uses its data or values 1 paper

Fig. 3 of [ref] displays the most important branching fractions for final states in $χχ$ annihilations as functions of $m_1/2$ along the WMAP strips for $tanβ= 10$ and 55, which include the final states $τ^+ τ^-$, $b b̅$, $W^+ W^-$, $t t̅$, $hZ$ and $ZZ$.

An Enhanced Cosmological Li6 Abundance as a Potential Signature of Residual Dark Matter Annihilations · Numerical Results · 0.88

Cites it as background 4 papers

There were many targets investigated to search for the possible DM signals based on Fermi-LAT data, including the Milky Way dwarf galaxies [ref] , clusters of galaxies [ref] , the center and halo of the Milky Way [ref] , the globular clusters [ref] and so on.

Constraints on the dark matter annihilation from Fermi-LAT observation of M31 · Introduction · 0.93
As was also mentioned in the Introduction, points along these WMAP-compatible strips are often used as benchmarks [ref] for dark matter searches [ref] , e.g., via scattering [ref] or annihilations into neutrinos [ref] or photons [ref] .

Revisiting the Higgs Mass and Dark Matter in the CMSSM · Dark Matter Strips · 0.90
In the usual neutralino dark matter scenario, annihilation in the Galactic halo tends to be suppressed due to the p-wave dominance of the annihilation cross section because of the Majorana nature of the neutralino (see, e.g., the recent study of the gamma ray flux for neutralinos in the cMSSM in Ref. [ref] ).

Very light right-handed sneutrino dark matter in the NMSSM · Indirect detection · 0.91

What it cites · 55 sentences without a confident label

Uses the method or tool of 6 papers

In order to calculate the ICS part we follow the tools and methods described in [ref] .

Constraining Dark Matter Properties with Gamma-Rays from the Galactic Center with Fermi-LAT · The Inverse Compton Scattering component · 1.00
In order to calculate the ICS part we follow the tools and methods described in [ref] .

PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection · The Inverse Compton Scattering component · 1.00
In particular, we follow [ref] and references therein, parametrizing the fits of photon spectra produced by PYTHIA, in order to obtain the differential flux as an analytic function of the parameter $x=E_γ/m_χ$, for each LSP mass $m_χ$.

Photon spectra from WIMP annihilation · CMSSM Dark Matter Annihilation Processes · 0.92

Uses data or values from 4 papers

We start with a nominal implementation of the current experimental situation, that uses the present Fermi-LAT data set [ref] , assumes the current understanding of the background and systematic errors, and uses an NFW density profile.

Observations of Milky Way Dwarf Spheroidal galaxies with the Fermi-LAT detector and constraints on Dark Matter models · Experimental Perspectives · 0.96
We use the first 11-month Fermi-LAT catalogue [ref] , which contains 1451 point sources modelled in the energy range 100 MeV to 100 GeV.

Fermi Large Area Telescope First Source Catalog · The background and Fermi-LAT data · 0.96
In each case, we have fixed $A_0 = 0$ and for each value of $m_1/2$ we have adjusted the value of $m_0$ to obtain the WMAP value of the relic density, $Ω_χh^2 = 0.1109 ±0.0056$ [ref] .

Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation · CMSSM Dark Matter Annihilation Processes · 1.00

Compares with 2 papers

Our results for the continuum component agree very well with those of [ref] .

Photon spectra from WIMP annihilation · CMSSM Dark Matter Annihilation Processes · 1.00
Our results for the continuum component agree very well with those of [ref] .

PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection · CMSSM Dark Matter Annihilation Processes · 1.00

Cites as background 26 papers

In particular, we discuss possible dark matter profiles towards the center of the galaxy, including Navarro-Frenk-White (NFW) [ref] and Einasto models [ref] , as well as a simple isothermal model [ref] .

Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and Comparison with Parametric Models · Introduction · 0.82
In particular, we discuss possible dark matter profiles towards the center of the galaxy, including Navarro-Frenk-White (NFW) [ref] and Einasto models [ref] , as well as a simple isothermal model [ref] .

The Structure of Cold Dark Matter Halos · Introduction · 0.82
Foremost among such scenarios is the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which the soft supersymmetry-breaking parameters $m_0$, $m_1/2$ and $A_0$ are assumed to be universal at the supersymmetric GUT scale [ref] .

Supersymmetric Dark Matter in Light of WMAP · Introduction · 0.99

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