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2015

Dark Higgs Channel for FERMI GeV $\gamma$-ray Excess

Ko, P., Tang, Yong

Understand

Dark Higgs is very generic in dark matter models where DM is stabilized by some spontaneously broken dark gauge symmetries.

Motivated by the FERMI observation of $\sim$GeV scale $\gamma$-ray excess from the galactic center (GC), we investigate a scenario that a pair of dark matter $X$ annihilates into a pair of dark Higgs $H_2$, which subsequently decays into standard model particles through its mixing with SM Higgs boson.
Besides the two-body decay of $H_2$, we also include multibody decay channels of the dark Higgs.
We find that the best-fit point is around $M_X\simeq 95.0$GeV, $M_{H_2}\simeq 86.7$GeV, $\langle \sigma v\rangle\simeq 4.0\times 10^{-26}\textrm{cm}^3\textrm{/s}$ and gives a p-value $\simeq 0.40$.