Enhanced rare pion decays from a model of MeV dark matter
Enhanced rare pion decays from a model of MeV dark matter
A model has been proposed in which neutral scalar particles $\ensuremath{\chi}$, of mass 1--10 MeV, annihilate through the exchange of a light vector boson $U$, of mass 10--100 MeV, to produce the 511 keV line observed emanating from the center of the Galaxy. The $\ensuremath{\chi}$ interacts weakly with normal matter …