$SU(2{)}_X$ Vector DM and Galactic Center Gamma-Ray Excess

Abstract

An unbroken $Z_3$ symmetry remains when local $SU(2{)}_X$ is broken spontaneously by one quadruplet. The gauge boson ${\chi }_{\mu }({\bar{\chi }}_{\mu })$ carries the dark charge and is the candidate of dark matter (DM). By the mixture of scalar boson ${\varphi }_r$ of quadruplet and standard model (SM) Higgs, the DM can annihilate to SM particles through Higgs portal. For investigating the implications of vector DM, we study the relic density of DM, the direct detection of DM-nucleon scattering and the excess of gamma-ray spectrum, which is supported by the data from {\it Fermi} Gamma-Ray Space Telescope. We find that with the DM mass of around $70$ GeV in our model, the excess of gamma-ray could be fitted well with the data.

arXiv comment17 pages, 12 figures, final version published in physics letters B

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