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- W2000703767 abstract "We propose a possible explanation for the recent claim of an excess at 3.5 keV in the x-ray spectrum within a minimal extension of the standard model that explains dark matter and baryon abundance of the Universe. The dark matter mass in this model is $mathcal{O}(text{GeV})$ and its relic density has a nonthermal origin. The model includes two colored scalars of $mathcal{O}(text{TeV})$ mass (${X}_{1,2}$), and two singlet fermions that are almost degenerate in mass with the proton (${N}_{1,2}$). The heavier fermion ${N}_{2}$ undergoes radiative decay to the lighter one ${N}_{1}$ that is absolutely stable. Radiative decay with a lifetime $ensuremath{sim}{10}^{23}$ seconds can account for the claimed 3.5 keV line, which requires couplings $ensuremath{sim}{10}^{ensuremath{-}3}--{10}^{ensuremath{-}1}$ between ${X}_{1,2}$, ${N}_{1,2}$ and the up-type quarks. The model also gives rise to potentially detectable monojet, dijet, and monotop signals at the LHC." @default.
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- W2000703767 date "2014-06-30" @default.
- W2000703767 modified "2023-09-23" @default.
- W2000703767 title "keV photon emission from light nonthermal dark matter" @default.
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- W2000703767 doi "https://doi.org/10.1103/physrevd.89.127305" @default.
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