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2007

Galactic 511 keV line from MeV millicharged dark matter

Huh, Ji-Haeng, Kim, Jihn E., Park, Jong-Chul et al.

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We present a possible explanation of the recently observed 511 keV $\gamma$-ray anomaly with a new ``millicharged'' fermion.

The new fermion is light (${\cal O}({\rm MeV})$) but has never been observed by any collider experiments mainly because of its tiny electromagnetic charge $\epsilon e$.
We show that constraints from its relic density in the Universe and collider experiments allow a parameter range such that the 511 keV cosmic $\gamma$-ray emission from the galactic bulge may be due to positron production from this millicharged fermion.

Galactic 511 keV line from MeV millicharged dark matter · Around

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