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There is a robust signal for a 511 keV photon line from the galactic centerwhich may originate from dark matter particles with masses of a few MeV. Toavoid the bounds from delayed recombination and from the absence of the linefrom dwarf galaxies, in 2017, we have proposed a model in which dark matterfirst decays into a pair of intermediate pico-charged particles $C\bar{C}$ witha lifetime much larger than the age of the universe. The galactic magneticfield accumulates the relativistic $C\bar{C}$ that eventually annihilate,producing the $e^-e^+$ pair that give rise to the 511 keV line. Therelativistic pico-charged $C$ particles can scatter on the electrons inside thedirect dark matter search detectors imparting a recoil energy of $E_r\sim$~keV. We show that this model can account for the electron recoil excessrecently reported by the XENON1T experiment. Moreover, we show that the XENON1Telectron recoil data sets the most stringent bound on the lifetime of the darkmatter within this model.

Pico-charged particles explaining 511 keV line and XENON1T signal