Abstract
Observations with the Fermi Large Area Telescope (LAT) indicate a possible small photon signal originating from the dwarf galaxy Reticulum II that exceeds the expected background between 2 GeV and 10 GeV . We have investigated two specific scenarios for annihilating WIMP dark matter within the phenomenological Minimal Supersymmetric Standard Model (pMSSM) framework as a possible source for these photons. We find that the same parameter ranges in pMSSM as reported by an earlier paper to be consistent with the Galactic Center excess, are also consistent with the excess observed in Reticulum II, resulting in a J-factor of log 10(J(αint=0.5̂)) ≃ (20.3−20.5)+0.2−0.3 GeV2cm−5. This J-factor is consistent with log 10(J(αint=0.5̂)) = 19.6+1.0−0.7 GeV2cm−5, which was derived using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System (M2FS).
Highlights
Masses of the first and second generation sfermions are equal, separately in the lepton and quark sectors
We show the exact parameter ranges in the phenomenological Minimal Supersymmetric Standard Model (pMSSM) for each scenario
The resulting photon fluxes are fitted with the photon spectrum of Reticulum II, leaving the J-factor as a fitting parameter
Summary
Masses of the first and second generation sfermions are equal, separately in the lepton and quark sectors. The Fermi and DES collaborations found a less significant excess (p-value of 0.05 including a trials factor from testing multiple DM masses and channels, corresponding to a global significance of 1.65 σ), using an updated (Pass 8) data set [41]. This study has no channel and mass trials factor since the DM mass and shape are fixed by the pMSSM model and the Galactic Center excess data. [31], it is shown that there are three pMSSM parameter ranges that are consistent with the GC photon excess as originating from annihilating DM.
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