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WIMPs at the Galactic Center | | Prateek Agrawal
; Brian Batell
; Patrick J. Fox
; Roni Harnik
; | | Date: |
10 Nov 2014 | | Abstract: | Simple models of weakly interacting massive particles (WIMPs) predict dark
matter annihilations into pairs of electroweak gauge bosons, Higgses or tops,
which through their subsequent cascade decays produce a spectrum of gamma rays.
Intriguingly, an excess in gamma rays coming from near the Galactic center has
been consistently observed in Fermi data. A recent analysis by the Fermi
collaboration confirms these earlier results. Taking into account the
systematic uncertainties in the modelling of the gamma ray backgrounds, we show
for the first time that this excess can be well fit by these final states. In
particular, for annihilations to $(WW, ZZ, hh, tt)$, dark matter with mass
between threshold and approximately (165, 190, 280, 310) GeV gives an
acceptable fit. The fit range for $bar{b}$ is also enlarged to 35
GeV$lesssim m_chi lesssim$ 165 GeV. These are to be compared to previous
fits that concluded only much lighter dark matter annihilating into $b$,
$ au$, and light quark final states could describe the excess. We demonstrate
that simple, well-motivated models of WIMP dark matter including a
thermal-relic neutralino of the MSSM, Higgs portal models, as well as other
simplified models can explain the excess. | | Source: | arXiv, 1411.2592 | | Services: | Forum | Review | PDF | Favorites | |
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